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'''Evolutionary psychology''' ('''EP''') is an approach in the [[social science|social]] and [[natural science]]s that examines psychological [[Trait theory|traits]] such as [[memory]], [[perception]], and [[language]] from a [[Modern evolutionary synthesis|modern evolutionary perspective]]. It seeks to identify which human psychological traits are evolved [[adaptation]]s – that is, the functional products of [[natural selection]] or [[sexual selection]]. [[Adaptationist]] thinking about physiological mechanisms, such as the heart, lungs, and immune system, is common in [[evolutionary biology]]. Some evolutionary psychologists apply the same thinking to psychology, arguing that the [[Modularity of mind|mind has a modular structure]] similar to that of the body, with different modular adaptations serving different functions. Evolutionary psychologists argue that much of human behavior is the output of [[psychological adaptation]]s that evolved to solve recurrent problems in human ancestral environments.<ref>Confer et al. 2010; Buss, 2005; Durrant & Ellis, 2003; Pinker, 2002; Tooby & Cosmides, 2005</ref>


The adaptationist approach is steadily increasing as an influence in the general field of psychology.<ref name="moralanimal"/><ref name="Psychology"/>
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Evolutionary psychologists suggest that EP is not simply a subdiscipline of psychology but that evolutionary theory can provide a foundational, metatheoretical framework that integrates the entire field of psychology, in the same way it has for biology.<ref name="Cosmides"/><ref>Duntley and Buss 2008</ref><ref>Carmen, R.A., et al. (2013). Evolution Integrated Across All Islands of the Human Behavioral Archipelago: All Psychology as Evolutionary Psychology.  EvoS Journal: The Journal of the Evolutionary Studies Consortium, 5, pp. 108–26. {{ISSN|1944-1932}} [http://evostudies.org/wp-content/uploads/2013/03/Carmen_-Vol5Iss1.pdf PDF]</ref>
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Evolutionary psychologists hold that behaviors or traits that occur universally in all cultures are good candidates for evolutionary adaptations<ref name="Psychology">Schacter et al. 2007, pp. 26–27</ref> including the abilities to infer others' emotions, discern kin from non-kin, identify and prefer healthier mates, and cooperate with others. They report successful tests of theoretical predictions related to such topics as [[infanticide]], [[intelligence]], [[marriage]] patterns, [[promiscuity]], perception of [[beauty]], [[bride price]], and [[parental investment]].<ref name=social-behavior>"Despite this difficulty, there have been many careful and informative studies of human social behavior from an evolutionary perspective. Infanticide, intelligence, marriage patterns, promiscuity, perception of beauty, bride price, altruism, and the allocation of parental care have all been explored by testing predictions derived from the idea that conscious and unconscious behaviours have evolved to maximize inclusive fitness. The findings have been impressive." "social behaviour, animal." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. 23 Jan 2011. [http://www.britannica.com/EBchecked/topic/550897/animal-social-behaviour].</ref>
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The theories and findings of EP have applications in many fields, including economics, environment, health, law, management, [[psychiatry]], politics, and literature.<ref name=Oxford2007>The Oxford Handbook of Evolutionary Psychology, Edited by Robin Dunbar and Louise Barret, Oxford University Press, 2007</ref><ref>The Handbook of Evolutionary Psychology, edited by David M. Buss, John Wiley & Sons, Inc., 2005</ref>
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[[Criticism of evolutionary psychology|Controversies concerning EP]] involve questions of testability, cognitive and evolutionary assumptions (such as modular functioning of the brain, and large uncertainty about the ancestral environment), importance of non-genetic and non-adaptive explanations, as well as political and ethical issues due to interpretations of research results.<ref>{{cite book|last=Rose|first=Hilary|title=Alas, Poor Darwin : Arguments Against Evolutionary Psychology|year=2000|publisher=Harmony; 1 Amer ed edition (10 October 2000)|isbn=0-609-60513-5|url=http://www.amazon.com/Alas-Poor-Darwin-Evolutionary-Psychology/dp/0609605135}}</ref>
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Evolutionary psychology is an approach that views [[human nature]] as the product of a universal set of evolved psychological adaptations to recurring problems in the ancestral environment. Proponents of EP suggest that it seeks to integrate psychology into the other natural sciences, rooting it in the organizing theory of biology ([[evolutionary theory]]), and thus understanding [[psychology]] as a branch of [[biology]]. Anthropologist [[John Tooby]] and psychologist [[Leda Cosmides]] note:
 
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<blockquote>"Evolutionary psychology is the long-forestalled scientific attempt to assemble out of the disjointed, fragmentary, and mutually contradictory human disciplines a single, logically integrated research framework for the psychological, social, and behavioral sciences—a framework
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that not only incorporates the evolutionary sciences on a full and equal basis, but that systematically works out all of the revisions in existing belief and research practice that such a synthesis requires."<ref>Tooby & Cosmides 2005, p. 5</ref></blockquote>


Just as human [[physiology]] and [[evolutionary physiology]] have worked to identify physical adaptations of the body that represent "human physiological nature," the purpose of evolutionary psychology is to identify evolved emotional and cognitive adaptations that represent "human psychological nature."  According to [[Steven Pinker]], EP is "not a single theory but a large set of hypotheses" and a term that "has also come to refer to a particular way of applying evolutionary theory to the mind, with an emphasis on adaptation, gene-level selection, and modularity."  Evolutionary psychology adopts an understanding of the mind that is based on the [[computational theory of mind]]. It describes mental processes as computational operations, so that, for example, a fear response is described as arising from a neurological computation that inputs the perceptional data, e.g. a visual image of a spider, and outputs the appropriate reaction, e.g. fear of possibly dangerous animals.
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While philosophers have generally considered the human mind to include broad faculties, such as reason and lust, evolutionary psychologists describe evolved psychological mechanisms as narrowly focused to deal with specific issues, such as catching cheaters or choosing mates. EP views the [[human brain]] as comprising many functional mechanisms,{{Citation needed|date=June 2011}} called ''psychological adaptations'' or evolved cognitive mechanisms or ''[[cognitive modules]]'', designed by the process of natural selection. Examples include [[language acquisition|language-acquisition modules]], [[Westermarck effect|incest-avoidance mechanisms]], [[Wason selection task|cheater-detection mechanisms]], intelligence and sex-specific mating preferences, foraging mechanisms, alliance-tracking mechanisms, agent-detection mechanisms, and others. Some mechanisms, termed ''domain-specific'', deal with recurrent adaptive problems over the course of human evolutionary history.{{Citation needed|date=June 2011}} ''Domain-general'' mechanisms, on the other hand, are proposed to deal with evolutionary novelty.{{Citation needed|date=June 2011}}
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EP has roots in [[cognitive psychology]] and evolutionary biology but also draws on [[behavioral ecology]], [[artificial intelligence]], [[genetics]], [[ethology]], [[anthropology]], [[archaeology]], biology, and [[zoology]]. EP is closely linked to [[sociobiology]],<ref name="Psychology"/> but there are key differences between them including the emphasis on ''domain-specific'' rather than ''domain-general'' mechanisms, the relevance of measures of current [[fitness (biology)|fitness]], the importance of [[mismatch theory]], and psychology rather than behavior. Most of what is now labeled as sociobiological research is now confined to the field of behavioral ecology.{{Citation needed|date=February 2008}}
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[[Nikolaas Tinbergen]]'s [[Tinbergen's four questions|four categories of questions]] can help to clarify the distinctions between several different, but complementary, types of explanations.<ref>Nesse, R.M. (2000). Tingergen's Four Questions Organized. [http://www-personal.umich.edu/~nesse/Nesse-Tinbergen4Q.PDF Read online].</ref> Evolutionary psychology focuses primarily on the "why?" questions, while traditional psychology focuses on the "how?" questions.<ref name="Gaulin, Steven J. C 2003. pp. 1–24">Gaulin and McBurney 2003 pp. 1–24.</ref>
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{| class="wikitable"
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|-
 
| colspan="2" rowspan="2" |
  <li>[http://ldsbee.com/index.php?page=item&id=2246026 http://ldsbee.com/index.php?page=item&id=2246026]</li>
! colspan="2" | ''Sequential vs. Static Perspective''
 
|-
  <li>[http://60.191.126.74:2222/dengpin/bbs/forum.php?mod=viewthread&tid=313952 http://60.191.126.74:2222/dengpin/bbs/forum.php?mod=viewthread&tid=313952]</li>
| '''Historical/Developmental'''<br />''Explanation of current form in terms of a historical sequence''
 
| '''Current Form'''<br />''Explanation of  the current form of species''
  <li>[http://www.edu666.net/bbs/forum.php?mod=viewthread&tid=2331396 http://www.edu666.net/bbs/forum.php?mod=viewthread&tid=2331396]</li>
|-
 
! rowspan="2" | ''How vs. Why Questions''
  <li>[http://bbs.lmzol.com/forum.php?mod=viewthread&tid=3941721 http://bbs.lmzol.com/forum.php?mod=viewthread&tid=3941721]</li>
| '''Proximate'''<br />'''''How''''' an individual organism's structures function
 
| '''Ontogeny'''<br />Developmental explanations for changes in '''''individuals''''', from DNA to their current form
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| '''Mechanism'''<br />Mechanistic explanations for how an organism's structures work
 
|-
</ul>
| '''Evolutionary'''<br />'''''Why''''' a species evolved the structures (adaptations) it has
| '''Phylogeny'''<br />The history of the evolution of sequential changes in a '''''species''''' over many generations
| '''Adaptation'''<br />A species trait that evolved to solve a reproductive or survival problem in the ancestral environment
|}


===Premises===
== Nike Air Presto  de détritus ==
Evolutionary psychology is founded on several core premises.


# The brain is an information processing device, and it produces behavior in response to external and internal inputs.<ref name="Cosmides">{{cite web |last=Cosmides |first=L |authorlink=Leda Cosmides |coauthors=[[John Tooby|Tooby J]] |date=13 January 1997 |url=http://www.psych.ucsb.edu/research/cep/primer.html |title= Evolutionary Psychology: A Primer |accessdate=2008-02-16 |publisher=Center for Evolutionary Psychology}}</ref><ref name = "Buss about">[http://homepage.psy.utexas.edu/homepage/Group/BussLAB/about.htm Evolutionary Psychology at the University of Texas]</ref>
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# The brain's adaptive mechanisms were shaped by natural and sexual selection.<ref name="Cosmides"/><ref name = "Buss about"/>
 
# Different neural mechanisms are specialized for solving problems in humanity's evolutionary past.<ref name="Cosmides"/><ref name = "Buss about"/>
  <li>[http://test.bpmn.info/forum/read.php?2,280305 http://test.bpmn.info/forum/read.php?2,280305]</li>
# The brain has evolved specialized neural mechanisms that were designed for solving problems that recurred over deep evolutionary time,<ref name = "Buss about"/> giving modern humans stone-age minds.<ref name="Cosmides"/>
 
# Most contents and processes of the brain are unconscious; and most mental problems that seem easy to solve are actually extremely difficult problems that are solved unconsciously by complicated neural mechanisms.<ref name="Cosmides"/>
  <li>[http://www.dq258.com/news/html/?639639.html http://www.dq258.com/news/html/?639639.html]</li>
# Human psychology consists of many specialized mechanisms, each sensitive to different classes of information or inputs. These mechanisms combine to produce manifest behavior.<ref name = "Buss about"/>
 
 
  <li>[http://www.weixiyang.com/bbs/forum.php?mod=viewthread&tid=1625234 http://www.weixiyang.com/bbs/forum.php?mod=viewthread&tid=1625234]</li>
==History==
 
[[Image:Lorenz and Tinbergen1.jpg|thumb|Nobel Laureates [[Nikolaas Tinbergen]] (left) and [[Konrad Lorenz]] (right) who were, with [[Karl von Frisch]], acknowledged for work on animal behavior<ref name="nobel-1973">
  <li>[http://www.xamlt.net/forum.php?mod=viewthread&tid=76077&extra= http://www.xamlt.net/forum.php?mod=viewthread&tid=76077&extra=]</li>
{{cite web
 
| url = http://nobelprize.org/nobel_prizes/medicine/laureates/1973/index.html
  <li>[http://222.173.43.176:901/bbs/boke.asp?lauszwif.showtopic.115588.html http://222.173.43.176:901/bbs/boke.asp?lauszwif.showtopic.115588.html]</li>
| title = The Nobel Prize in Physiology or Medicine 1973
 
| accessdate = 2007-07-28
</ul>
| publisher = Nobel Foundation
}}</ref>]]
 
{{Main|History of evolutionary psychology}}
Evolutionary psychology has its historical roots in [[Charles Darwin]]’s theory of natural selection.<ref name="Psychology"/> In ''The Origin of Species'', Darwin predicted that psychology would develop an evolutionary basis:
{{quote|In the distant future I see open fields for far more important researches. Psychology will be based on a new foundation, that of the necessary acquirement of each mental power and capacity by gradation.|Charles Darwin, The Origin of Species, 1859, p. 449.}}
Two of his later books were devoted to the study of animal emotions and psychology; ''[[The Descent of Man, and Selection in Relation to Sex]]'' in 1871 and ''[[The Expression of the Emotions in Man and Animals]]'' in 1872. Darwin's work inspired [[William James]]’s functionalist approach to psychology.<ref name="Psychology"/> Darwin's theories of evolution, adaptation, and natural selection have provided insight into why brains function the way they do.<ref name=Schacter>{{cite book|last=Schacter|title=Psychology 2nd Ed.|publisher=Worth Publishers|isbn=978-1-4292-3719-2}}</ref><ref>{{cite book|last=Schacter|first=Daniel L.|title=Psychology|year=2011|publisher=Worth Publishers|location=New York, NY|page=26|edition=2|coauthors=Daniel T. Gilbert, Daniel M. Wegner}}</ref>
 
The content of EP has derived from, on one hand, the biological sciences (especially [[evolution]]ary theory as it relates to ancient human environments, the study of [[paleoanthropology]] and animal behavior) and, on the other, the human sciences, especially psychology.
 
Evolutionary biology as an [[academic discipline]] emerged with the [[modern evolutionary synthesis]] in the 1930s and 1940s.<ref>Sterelny, Kim. 2009. In Ruse, Michael & Travis, Joseph (eds) Wilson, Edward O. (Foreword) Evolution: The First Four Billion Years. Harvard University Press, Cambridge, Ma. ISBN 978-0-674-03175-3. p. 314.</ref> In the 1930s the study of animal behavior (ethology) emerged with the work of Dutch biologist Nikolaas Tinbergen and Austrian biologists [[Konrad Lorenz]] and [[Karl von Frisch]].
 
W.D. Hamilton's (1964) papers on [[inclusive fitness]] and [[Robert Trivers]]'s (1972)<ref name="Trivers1971">{{cite journal | jstor = 2822435 | pages = 35–57 | last1 = Trivers | first1 = R. L. | title = The Evolution of Reciprocal Altruism | volume = 46 | issue = 1 | journal = [[The Quarterly Review of Biology]] | year = 1971 | doi=10.1086/406755}}</ref> theories on [[reciprocity (evolution)|reciprocity]] and parental investment helped to establish evolutionary thinking in psychology and the other social sciences. In 1975, [[E.O. Wilson|Edward O. Wilson]] combined evolutionary theory with studies of animal and social behavior, building on the works of Lorenz and Tinbergen, in his book ''[[Sociobiology: The New Synthesis]]''.
 
In the 1970s, two major branches developed from ethology. Firstly, the study of animal ''social'' behavior (including humans) generated sociobiology, defined by its pre-eminent proponent Edward O. Wilson in 1975 as "the systematic study of the biological basis of all social behavior"<ref>Wilson, Edward O. 1975.[http://www.hup.harvard.edu/catalog/WILSOR.html ''Sociobiology:  The New Synthesis''.] Harvard University Press, Cambridge, Ma. ISBN 0-674-00089-7 p. 4.</ref> and in 1978 as "the extension of population biology and evolutionary theory to social organization."<ref>Wilson, Edward O. 1978. ''On Human Nature''. Harvard University Press, Cambridge, Ma. p. x.</ref> Secondly, there was behavioral ecology which placed less emphasis on ''social'' behavior by focusing on the ecological  and evolutionary basis of both animal and [[human behavioral ecology|human]] behavior.
 
In the 1970s and 1980s university departments began to include the term ''evolutionary biology'' in their titles. The modern era of evolutionary psychology was ushered in, in particular, by [[Donald Symons]]' 1979 book ''The Evolution of Human Sexuality'' and [[Leda Cosmides]] and [[John Tooby]]'s 1992 book ''[[The Adapted Mind]]''.<ref name="Psychology"/>
 
From psychology there are the primary streams of [[developmental psychology|developmental]], [[social psychology|social]] and cognitive psychology.  Establishing some measure of the relative influence of genetics and environment on behavior has been at the core of [[Behavioural genetics|behavioral genetics]] and its variants, notably studies at the molecular level that examine the relationship between genes, neurotransmitters and behavior. [[Dual inheritance theory]] (DIT), developed in the late 1970s and early 1980s, has a slightly different perspective by trying to explain how [[human behavior]] is a product of two different and interacting evolutionary processes: [[genetic evolution]]  and [[cultural evolution]]. DIT is seen by some as a "middle-ground" between views that emphasize human universals versus those that emphasize cultural variation.<ref>Laland, Kevin N. and Gillian R. Brown.  2002. ''Sense & Nonsense: Evolutionary Perspectives on Human Behavior.'' Oxford University Press, Oxford. pp. 287–319.</ref>
 
==Theoretical foundations==
{{Main|Theoretical foundations of evolutionary psychology}}
The theories on which evolutionary psychology is based originated with Charles Darwin's work, including his speculations about the evolutionary origins of social instincts in humans. Modern evolutionary psychology, however, is possible only because of advances in evolutionary theory in the 20th century.
 
Evolutionary psychologists say that natural selection has provided humans with many psychological adaptations, in much the same way that it generated humans' anatomical and physiological adaptations.<ref name="Gaulin, Steven J. C 2003. pp. 25–56">Gaulin and McBurney 2003 pp. 25–56.</ref> As with adaptations in general, psychological adaptations are said to be specialized for the environment in which an organism evolved, the environment of evolutionary adaptedness, or EEA.<ref name="Gaulin, Steven J. C 2003. pp. 25–56"/><ref name="Economics, e 2003">See also "Environment of evolutionary adaptation," a variation of the term used in Economics, e.g., in Rubin, Paul H., 2003, ''"Folk economics"'' Southern Economic Journal, 70:1, July 2003, 157–171.</ref> Sexual selection provides organisms with adaptations related to mating.<ref name="Gaulin, Steven J. C 2003. pp. 25–56"/> For [[male mammals]], which have a relatively high maximal potential reproduction rate, sexual selection leads to adaptations that help them compete for females.<ref name="Gaulin, Steven J. C 2003. pp. 25–56"/> For [[female mammals]], with a relatively low maximal potential reproduction rate, sexual selection leads to choosiness, which helps females select higher quality mates.<ref name="Gaulin, Steven J. C 2003. pp. 25–56"/> Charles Darwin described both natural selection and sexual selection, and he relied on group selection to explain the evolution of [[Altruism|altruistic]] (self-sacrificing) behavior. But group selection was considered a weak explanation, because in any group the less altruistic individuals will be more likely to survive, and the group will become less self-sacrificing as a whole.
 
In 1964, [[W.D. Hamilton|William D. Hamilton]] proposed inclusive fitness theory, emphasizing a "[[gene-centered view of evolution|gene's-eye]]" view of evolution. Hamilton noted that individuals can increase the replication of their genes into the next generation by helping close relatives with whom they share genes survive and reproduce. According to "[[Hamilton's rule]]", a self-sacrificing behavior can evolve if it helps close relatives so much that it more than compensates for the individual animal's sacrifice. Inclusive fitness theory resolved the issue of how "altruism" evolved. Other theories also help explain the evolution of altruistic behavior, including [[evolutionary game theory]], [[tit-for-tat]] reciprocity, and generalized reciprocity. These theories not only help explain the development of altruistic behavior, but also account for hostility toward cheaters (individuals that take advantage of others' altruism).<ref name = "moralanimal"/>
 
Several mid-level evolutionary theories inform evolutionary psychology. The [[r/K selection]] theory proposes that some species prosper by having many offspring, while others follow the strategy of having fewer offspring but investing much more in each one. Humans follow the second strategy. Parental investment theory explains how parents invest more or less in individual offspring based on how successful those offspring are likely to be, and thus how much they might improve the parents' inclusive fitness. According to the [[Trivers-Willard hypothesis]], parents in good conditions tend to invest more in sons (who are best able to take advantage of good conditions), while parents in poor conditions tend to invest more in daughters (who are best able to have successful offspring even in poor conditions). According to [[life history theory]], animals evolve life histories to match their environments, determining details such as age at first reproduction and number of offspring. Dual inheritance theory posits that genes and human culture have interacted, with genes affecting the development of culture, and culture, in turn, affecting human evolution on a genetic level (see also the [[Baldwin effect]]).
 
==Evolved psychological mechanisms==
{{Main|psychological adaptation|l1=Evolved psychological mechanisms}}
Evolutionary psychology is based on the hypothesis that, just like hearts, lungs, livers, kidneys, and immune systems, cognition has functional structure that has a genetic basis, and therefore has evolved by natural selection. Like other organs and tissues, this functional structure should be universally shared amongst a species, and should solve important problems of survival and [[reproduction]].
 
Evolutionary psychologists seek to understand psychological mechanisms by understanding the survival and reproductive functions they might have served over the course of evolutionary history.{{Citation needed|date=August 2011}} These might include abilities to infer others' emotions, discern kin from non-kin, identify and prefer healthier mates, or cooperate with others. Consistent with the theory of natural selection, evolutionary psychology sees humans as often in conflict with others, including mates and relatives. For instance, a mother may wish to wean her offspring from breastfeeding earlier than does her infant,  which frees up the mother to invest in additional offspring.<ref name="moralanimal"/><ref>{{cite web | url=http://scilib-biology.narod.ru/MoralAnimal/index_en.html | title=The Moral Animal Whe We Are The Way We Are: The New Science of Evolutionary Psychology | accessdate=15 October 2013 | author=Robert Wright}}</ref>  Evolutionary psychology also recognizes the role of kin selection and reciprocity in evolving prosocial traits such as altruism.<ref name="moralanimal"/> Like chimps and bonobos, humans have subtle and flexible social instincts, allowing them to form extended families, lifelong friendships, and political alliances.<ref name="moralanimal"/> In studies testing theoretical predictions, evolutionary psychologists have made modest findings on topics such as infanticide, intelligence, marriage patterns, promiscuity, perception of beauty, bride price and parental investment.<ref name=social-behavior/>
 
===Products of evolution: adaptations, exaptations, byproducts, and random variation===
Not all traits of organisms are adaptations. As noted in the table below, traits may also be [[exaptation]]s, byproducts of adaptations (sometimes called "spandrels"), or random variation between individuals.<ref>Buss et al. 1998</ref>
 
Psychological adaptations are hypothesized to be innate or relatively easy to learn, and to manifest in cultures worldwide. For example, the ability of toddlers to learn a language with virtually no training is likely to be a psychological adaptation. On the other hand, ancestral humans did not read or write, thus today, learning to read and write require extensive training, and presumably represent byproducts of cognitive processing that use psychological adaptations designed for other functions.<ref>Pinker, Steven. (1994)The Language Instinct</ref> However, variations in manifest behavior can result from universal mechanisms interacting with different local environments. For example, Caucasians who move from a northern climate to the equator will have darker skin. The mechanisms regulating their pigmentation do not change; rather the input to the those mechanisms change, resulting in different output.
 
{| class="wikitable"
|-
!  !! Adaptation !! Exaptation !! By-Product !! Random Variation
|-
| Definition  || Organismic trait designed to solve an ancestral problem(s). Shows complexity, special "design", functionality  || Adaptation that has been "re-designed" to solve a different adaptive problem. || Byproduct of an adaptive mechanism with no current or ancestral function || Random variations in an adaptation or byproduct
|-
| Physiological  Example || Bones / Umbilical cord|| Small bones of the inner ear || White color of bones / Belly button  || Bumps on the skull, convex or concave belly button shape
|-
| Psychological Example  || Toddlers’ ability to learn to talk with minimal instruction. || Voluntary Attention || Ability to learn to read and write. || Within-sex variations in voice pitch.
|}
 
One of the tasks of evolutionary psychology is to identify which psychological traits are likely to be adaptations, byproducts or random variation. [[George C Williams]] suggested that an "adaptation is a special and onerous concept that should only be used where it is really necessary."<ref>George C Williams, ''Adaptation and Natural Selection''. p. 4.</ref>  As noted by Williams and others, adaptations can be identified by their improbable complexity, species universality, and adaptive functionality.
 
===Obligate and facultative adaptations===
A question that may be asked about an adaptation is whether it is generally obligate (relatively robust in the face of typical environmental variation) or facultative (sensitive to typical environmental variation).<ref name="Buss, D. M. 2011">Buss, D. M. (2011). Evolutionary psychology.</ref> The sweet taste of sugar and the pain of hitting one's knee against concrete are the result of fairly obligate psychological adaptations; typical environmental variability during development does not much affect their operation. By contrast, facultative adaptations are somewhat like "if-then" statements. For example, adult attachment style seems particularly sensitive to early childhood experiences. As adults, the propensity to develop close, trusting bonds with others is dependent on whether early childhood caregivers could be trusted to provide reliable assistance and attention. The adaptation for skin to tan is conditional to exposure to sunlight; this is an example of another facultative adaptation. When a psychological adaptation is facultative, evolutionary psychologists concern themselves with how developmental and environmental inputs influence the expression of the adaptation.
 
===Cultural universals===
{{main|Cultural universal}}
Evolutionary psychologists hold that behaviors or traits that occur universally in all cultures are good candidates for evolutionary adaptations.<ref name="Psychology"/> Cultural universals include behaviors related to language, cognition, social roles, gender roles, and technology.<ref>[[Donald E. Brown|Brown, Donald E.]] (1991) Human Universals. New York: McGraw-Hill.</ref> Evolved psychological adaptations (such as the ability to learn a language) interact with cultural inputs to produce specific behaviors (e.g., the specific language learned). Basic gender differences, such as greater eagerness for sex among men and greater coyness among women,<ref>Symons, D. (1979). The evolution of human sexuality. Oxford: Oxford University Press. Chapter 6.</ref> are explained as sexually dimorphic psychological adaptations that reflect the different reproductive strategies of males and females.<ref name="moralanimal"/><ref name="BS">Pinker 2002</ref> Evolutionary psychologists contrast their approach to what they term the "[[standard social science model]]," according to which the mind is a general-purpose cognition device shaped almost entirely by culture.<ref>Barkow et al. 1992</ref><ref name="instinct">"instinct." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. 18 Feb 2011. [http://www.britannica.com/EBchecked/topic/289249/instinct].</ref>
 
==Environment of evolutionary adaptedness==
{{Main|Human evolution}}
EP argues that to properly understand the functions of the brain, one must understand the properties of the environment in which the brain evolved. That environment is often referred to as the "environment of evolutionary adaptedness" (EEA).<ref name="Economics, e 2003"/>
 
The idea of an ''environment of evolutionary adaptedness'' was first explored as a part of [[attachment theory]] by [[John Bowlby]].{{Citation needed|date=July 2011}} This is the environment to which a particular evolved mechanism is adapted.  More specifically, the EEA is defined as the set of historically recurring selection pressures that formed a given adaptation, as well as those aspects of the environment that were necessary for the proper development and functioning of the adaptation.
 
Humans, comprising the genus ''[[Homo (genus)|Homo]]'', appeared between 1.5 and 2.5 million years ago, a time that roughly coincides with the start of the [[Pleistocene]] 2.6 million years ago. Because the Pleistocene ended a mere 12,000 years ago, most human adaptations either newly evolved during the Pleistocene, or were maintained by [[stabilizing selection]] during the Pleistocene.  Evolutionary psychology therefore proposes that the majority of human psychological mechanisms are adapted to reproductive problems frequently encountered in Pleistocene environments.<ref name=Symons1992>{{cite book
  |last= Symons
  |first=Donald
  |authorlink= Donald Symons
  |chapter=On the use and misuse of Darwinism in the study of human behavior
  |title=The Adapted Mind: Evolutionary psychology and the generation of culture
  |publisher=Oxford University Press
  |year= 1992
  |pages=137–59
  |isbn=0-19-510107-3
}}</ref>  In broad terms, these problems include those of growth, development, differentiation, maintenance, mating, parenting, and social relationships.
 
The EEA is significantly different from modern society.<ref name = "EBO social"/> The ancestors of modern humans lived in smaller groups, had more cohesive cultures, and had more stable and rich contexts for identity and meaning.<ref name = "EBO social">"social behaviour, animal." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. 23 Jan 2011. [http://www.britannica.com/EBchecked/topic/550897/animal-social-behaviour].</ref> Researchers look to existing hunter-gatherer societies for clues as to how hunter-gatherers lived in the EEA.<ref name="moralanimal"/> Unfortunately, the few surviving hunter-gatherer societies are different from each other, and they have been pushed out of the best land and into harsh environments, so it is not clear how closely they reflect ancestral culture.<ref name="moralanimal"/>
 
Evolutionary psychologists sometimes look to chimpanzees, bonobos, and other great apes for insight into human ancestral behavior.<ref name="moralanimal">Wright 1995</ref> Christopher Ryan and Cacilda Jetha argue that evolutionary psychologists have overemphasized the similarity of humans and chimps, which are more violent, while underestimating the similarity of humans and bonobos, which are more peaceful.<ref>Ryan, Christopher and Cacilda Jethá. Sex at Dawn: The Prehistoric Origins of Modern Sexuality. Harper. 2010.</ref>
 
===Mismatches===
Since an organism's adaptations were suited to its ancestral environment, a new and different environment can create a mismatch. Because humans are mostly adapted to Pleistocene environments, psychological mechanisms sometimes exhibit "mismatches" to the modern environment. One example is the fact that although about 10,000 people are killed with guns in the US annually,<ref>[http://www.cdc.gov/nchs/data/nvsr/nvsr54/nvsr54_10.pdf CDC pdf]</ref> whereas spiders and snakes kill only a handful, people nonetheless learn to fear spiders and snakes about as easily as they do a pointed gun, and more easily than an unpointed gun, rabbits or flowers.<ref name=Ohman2001>{{cite journal
  |author=Ohman, A.
  |coauthors=Mineka, S.
  |year=2001
  |title=Fears, phobias, and preparedness: Toward an evolved module of fear and fear learning
  |journal=Psychological Review
  |volume=108
  |issue=3
  |pages=483–522
  |url=http://instruct.uwo.ca/psychology/371g/Ohman2001.pdf
  |accessdate=2008-06-16
  |doi=10.1037/0033-295X.108.3.483
  |format=PDF
  |pmid=11488376
}}</ref>  A potential explanation is that spiders and snakes were a threat to human ancestors throughout the Pleistocene, whereas guns (and rabbits and flowers) were not. There is thus a mismatch between humans' evolved fear-learning psychology and the modern environment.<ref name=Pinker1999>{{Cite journal
|author=Pinker, S.
|title=How the Mind Works
|pages=386–89
|year=1999
|publisher=WW Norton & Co. New York
}}</ref><ref name=Hagen2006>{{cite journal
|doi=10.1016/j.tpb.2005.09.005
|pmid=16458945
|year=2006
|last1=Hagen
|first1=EH
|last2=Hammerstein
|first2=P
|title=Game theory and human evolution: a critique of some recent interpretations of experimental games
|volume=69
|issue=3
|pages=339–48
|journal=Theoretical population biology}}</ref>
 
This mismatch also shows up in the phenomena of the [[supernormal stimulus]], a stimulus that elicits a response more strongly than the stimulus for which the response evolved. The term was coined by [[Niko Tinbergen]] to refer to non-human animal behavior, but psychologist [[Deirdre Barrett]] said that supernormal stimulation governs the behavior of humans as powerfully as that of other animals. She explained junk food as an exaggerated stimulus to cravings for salt, sugar, and fats,<ref>Barrett, Deirdre. Waistland: The R/Evolutionary Science Behind Our Weight and Fitness Crisis (2007). New York: W.W. Norton. pp. 31–51.</ref> and she says that television is an exaggeration of social cues of laughter, smiling faces and attention-grabbing action.<ref>Barrett, Deirdre. Supernormal Stimuli: How Primal Urges Overran Their Evolutionary Purpose. New York: W.W. Norton, 2010</ref> Magazine centerfolds and double cheeseburgers pull instincts intended for an EEA where breast development was a sign of health, youth and fertility in a prospective mate, and fat was a rare and vital nutrient.<ref name=abcde>{{Cite journal
|title=Game theory and human evolution: A critique of some recent interpretations of experimental games
|year=2006
|journal=Theoretical Population Biology
|volume=69
|pages=339–48
|author=Hagen, E and Hammerstein, P
|doi=10.1016/j.tpb.2005.09.005
|pmid=16458945
|issue=3
}}</ref>
 
==Research methods==
Evolutionary theory is [[heuristic]] in that it may generate hypotheses that might not be developed from other theoretical approaches.  One of the major goals of adaptationist research is to identify which organismic traits are likely to be adaptations, and which are byproducts or random variations.  As noted earlier, adaptations are expected to show evidence of complexity, functionality, and species universality, while byproducts or random variation will not.  In addition, adaptations are expected to manifest as proximate mechanisms that interact with the environment in either a generally obligate or facultative fashion (see above).  Evolutionary psychologists are also interested in identifying these proximate mechanisms (sometimes termed "mental mechanisms" or "psychological adaptations") and what type of information they take as input, how they process that information, and their outputs.<ref name="Buss, D. M. 2011"/> [[Evolutionary developmental psychology]], or "evo-devo," focuses on how adaptations may be activated at certain developmental times (e.g., losing baby teeth, adolescence, etc.) or how events during the development of an individual may alter life history trajectories.
 
Evolutionary psychologists use several strategies to develop and test hypotheses about whether a psychological trait is likely to be an evolved adaptation.  Buss (2011)<ref>Buss, D.M. (2011). Evolutionary psychology. Chapter 2. Boston: Pearson/A and B.</ref> notes that these methods include:
 
:''Cross-cultural Consistency.''  Characteristics that have been demonstrated to be cross cultural [[human universals]] such as smiling, crying, facial expressions are presumed to be evolved psychological adaptations.  Several evolutionary psychologists have collected massive datasets from cultures around the world to assess cross-cultural universality.
 
:''Function to Form (or "problem to solution").'' The fact that males, but not females, risk potential misidentification of genetic offspring (referred to as "paternity insecurity") led evolutionary psychologists to hypothesize that, compared to females, male jealousy would be more focused on sexual, rather than emotional, infidelity.
 
:''Form to Function (reverse-engineering – or "solution to problem").'' [[Morning sickness]], and associated aversions to certain types of food, during pregnancy seemed to have the characteristics of an evolved adaptation (complexity and universality). [[Margie Profet]] hypothesized that the function was to avoid the ingestion of toxins during early pregnancy that could damage fetus (but which are otherwise likely to be harmless to healthy non-pregnant women).
 
:''Corresponding Neurological Modules.'' Evolutionary psychology and cognitive neuropsychology are mutually compatible – evolutionary psychology helps to identify psychological adaptations and their ultimate, evolutionary functions, while neuropsychology helps to identify the proximate manifestations of these adaptations.
 
Evolutionary psychologists also use various sources of data for testing, including experiments, [[archaeological record]]s, data from hunter-gatherer societies, observational studies, self-reports and surveys, [[public record]]s, and human products.<ref>{{cite book
  |last=Buss
  |first= David
  |authorlink=David Buss
  |title=Evolutionary Psychology: The New Science of the Mind
  |publisher=Pearson Education, Inc
  |year=2004
  |location= Boston
  |isbn=978-0-205-48338-9
}}</ref>
Recently, additional methods and tools have been introduced based on fictional scenarios,<ref name=Eldakar2006>{{cite journal
  |author=Omar Tonsi Eldakar
  |coauthors=David Sloan Wilson, and Rick O'Gorman.
  |year=2006
  |title=Emotions and actions associated with altruistic helping and punishment
  |journal=Evolutionary Psychology
  |volume=4
  |pages=274–86
  |url=http://www.epjournal.net/filestore/ep04274286.pdf
  |accessdate=2010-08-15
  |format=PDF
}}</ref> mathematical models,<ref name=Eldakar2008>{{cite journal
  |doi=10.1073/pnas.0712173105
  |author=Omar Tonsi Eldakar
  |coauthors=David Sloan Wilson.
  |year=2008
  |title=Selfishness as second-order altruism
  |journal=Proceedings of the National Academy of Sciences of the USA
  |volume=105
  |issue=19
  |pages=6982–6986
  |url=http://www.pnas.org/content/105/19/6982.full.pdf+html
  |accessdate=2010-08-15
  |format=PDF
  |pmid=18448681
  |pmc=2383986
}}</ref> and [[Agent based model|multi-agent computer simulations]].<ref name=Lima2009>{{cite journal
  |author=Francisco W.S. Lima
  |coauthors=Tarik Hadzibeganovic, and Dietrich Stauffer.
  |year=2009
  |title=Evolution of ethnocentrism on undirected and directed Barabási-Albert networks
  |journal=Physica A: Statistical Mechanics and its Applications
  |volume=388
  |pages=4999–5004
  |doi=10.1016/j.physa.2009.08.029
  |format=PDF
  |issue=24
}}</ref>
 
==Major areas of research==
Foundational areas of research in evolutionary psychology can be divided into broad categories of adaptive problems that arise from the theory of evolution itself: survival, mating, parenting, family and kinship, interactions with non-kin, and cultural evolution.
 
===Survival and individual level psychological adaptations===
Problems of survival are thus clear targets for the evolution of physical and psychological adaptations.{{Clarify|date=July 2011}}  Major problems the ancestors of present day humans faced included food selection and acquisition; territory selection and physical shelter; and avoiding predators and other environmental threats.<ref name="Buss, D.M. 2011">Buss, D.M. (2011). Evolutionary Psychology: The New Science of the Mind</ref>
 
==== Consciousness ====
{{See also|Consciousness|Animal consciousness}}
 
Consciousness is likely an evolved adaptation since it meets{{Opinion|date=July 2011}} [[George C. Williams|George Williams]]' criteria of species universality, complexity,<ref>* {{cite journal | jstor = 188711 | pages = 648–70 | last1 = Nichols | first1 = S. | last2 = Grantham | first2 = T. | title = Adaptive Complexity and Phenomenal Consciousness | volume = 67 | issue = 4 | journal = Philosophy of Science | year = 2000 | doi = 10.1086/392859 }}</ref>  and functionality, and it is a [[Phenotypic trait|trait]] that apparently increases fitness.<ref>Freeman and Herron. ''Evolutionary Analysis.'' 2007. Pearson Education, NJ.</ref>
 
In his paper "Evolution of consciousness," John Eccles argues that special anatomical and physical adaptations of the mammalian [[cerebral cortex]] gave rise to consciousness.<ref>{{cite journal | jstor = 2360081 | pages = 7320–7324 | last1 = Eccles | first1 = J. C. | title = Evolution of consciousness | volume = 89 | issue = 16 | journal = Proceedings of the National Academy of Sciences of the United States of America | year = 1992 | pmid = 1502142 | pmc = 49701 | doi=10.1073/pnas.89.16.7320}}</ref>  In contrast, others have argued that the recursive circuitry underwriting consciousness is much more primitive, having evolved initially in pre-mammalian species because it improves the capacity for interaction with both social ''and'' natural environments by providing an energy-saving "neutral" gear in an otherwise energy-expensive motor output machine.<ref>Peters, Frederic [http://precedings.nature.com/documents/2444/version/1 "Consciousness as Recursive, Spatiotemporal Self-Location"]</ref>  Once in place, this recursive circuitry may well have provided a basis for the subsequent development of many of the functions that consciousness facilitates in higher organisms, as outlined by Bernard J. Baars.<ref>Baars, Bernard J. ''A Cognitive Theory of Consciousness.'' 1993. Cambridge University Press.</ref>  Richard Dawkins suggested that humans evolved consciousness in order to make themselves the subjects of thought.<ref name = "Gaulin 5"/> Daniel Povinelli suggests that large, tree-climbing apes evolved consciousness to take into account one's own mass when moving safely among tree branches.<ref name = "Gaulin 5"/> Consistent with this hypothesis, Gordon Gallup found that chimps and orangutans, but not little monkeys or terrestrial gorillas, demonstrated self-awareness in mirror tests.<ref name = "Gaulin 5"/>
 
The concept of consciousness can refer to voluntary action, awareness, or wakefulness.<!--<ref name = "Gaulin 5"/>--> However, even voluntary behavior involves unconscious mechanisms.<!--<ref name = "Gaulin 5"/>--> Many cognitive processes take place in the cognitive unconscious, unavailable to conscious awareness.<!--<ref name = "Gaulin 5"/>--> Some behaviors are conscious when learned but then become unconscious, seemingly automatic.<!--<ref name = "Gaulin 5"/>--> Learning, especially implicitly learning a skill, can take place outside of consciousness.<!--<ref name = "Gaulin 5"/>--> For example, plenty of people know how to turn right when they ride a bike, but very few can accurately explain how they actually do so.<!--<ref name = "Gaulin 5"/> Evolutionary psychology approaches self-deception as an adaptation that can improve one's results in social exchanges.<!--<ref name = "Gaulin 5"/>-->
 
Sleep may have evolved to conserve energy when activity would be less fruitful or more dangerous, such as at night, especially in winter.<ref name = "Gaulin 5">Gaulin and McBurney 2003 p. 101-121.</ref>
 
====Sensation and perception====
Many experts, such as [[Jerry Fodor]], write that the purpose of perception is knowledge, but evolutionary psychologists hold that its primary purpose is to guide action.<ref name = "Gaulin 4"/> For example, they say, [[depth perception]] seems to have evolved not to help us know the distances to other objects but rather to help us move around in space.<ref name = "Gaulin 4"/> Evolutionary psychologists say that animals from fiddler crabs to humans use eyesight for collision avoidance, suggesting that vision is basically for directing action, not providing knowledge.<ref name = "Gaulin 4">Gaulin and McBurney 2003 pp. 81–101.</ref>
 
Building and maintaining sense organs is metabolically expensive, so these organs evolve only when they improve an organism's fitness.<ref name = "Gaulin 4"/> More than half the brain is devoted to processing sensory information, and the brain itself consumes roughly one-fourth of one's metabolic resources, so the senses must provide exceptional benefits to fitness.<ref name = "Gaulin 4"/> Perception accurately mirrors the world; animals get useful, accurate information through their senses.<ref name = "Gaulin 4"/>
 
Scientists who study perception and sensation have long understood the human senses as adaptations.<ref name = "Gaulin 4"/> Depth perception consists of processing over half a dozen visual cues, each of which is based on a regularity of the physical world.<ref name = "Gaulin 4"/> Vision evolved to respond to the narrow range of electromagnetic energy that is plentiful and that does not pass through objects.<ref name = "Gaulin 4"/> Sound waves go around corners and interact with obstacles, creating a complex pattern that includes useful information about the sources of and distances to objects.<ref name = "Gaulin 4"/> Larger animals naturally make lower-pitched sounds as a consequence of their size.<ref name = "Gaulin 4"/> The range over which an animal hears, on the other hand, is determined by adaptation. Homing pigeons, for example, can hear very low-pitched sound (infrasound) that carries great distances, even though most smaller animals detect higher-pitched sounds.<ref name = "Gaulin 4"/> Taste and smell respond to chemicals in the environment that are thought to have been significant for fitness in the EEA.<ref name = "Gaulin 4"/> For example, salt and sugar were apparently both valuable to the human or pre-human inhabitants of the EEA, so present day humans have an intrinsic hunger for salty and sweet tastes.<ref name = "Gaulin 4"/> The sense of touch is actually many senses, including pressure, heat, cold, tickle, and pain.<ref name = "Gaulin 4"/> Pain, while unpleasant, is adaptive.<ref name = "Gaulin 4"/> An important adaptation for senses is range shifting, by which the organism becomes temporarily more or less sensitive to sensation.<ref name = "Gaulin 4"/> For example, one's eyes automatically adjust to dim or bright ambient light.<ref name = "Gaulin 4"/> Sensory abilities of different organisms often coevolve, as is the case with the hearing of echolocating bats and that of the moths that have evolved to respond to the sounds that the bats make.<ref name = "Gaulin 4"/>
 
Evolutionary psychologists claim that perception demonstrates the principle of modularity, with specialized mechanisms handling particular perception tasks.<ref name = "Gaulin 4"/> For example, people with damage to a particular part of the brain suffer from the specific defect of not being able to recognize faces (prosopagnosia).<ref name = "Gaulin 4"/> EP suggests that this indicates a so-called face-reading module.<ref name = "Gaulin 4"/>
 
====Learning and facultative adaptations====
In evolutionary psychology, learning is said to be accomplished through evolved capacities, specifically facultative adaptations.<ref name = "LearningG8">Gaulin and McBurney 2003 Chapter 8.</ref> Facultative adaptations express themselves differently depending on input from the environment.<ref name = "LearningG8"/> Sometimes the input comes during development and helps shape that development.<ref name = "LearningG8"/> For example, migrating birds learn to orient themselves by the stars during a critical period in their maturation.<ref name = "LearningG8"/> Evolutionary psychologists claim that humans also learn language along an evolved program, also with critical periods.<ref name = "LearningG8"/> The input can also come during daily tasks, helping the organism cope with changing environmental conditions.<ref name = "LearningG8"/> For example, animals evolved Pavlovian conditioning in order to solve problems about causal relationships.<ref name = "LearningG8"/> Animals accomplish learning tasks most easily when those tasks resemble problems that they faced in their evolutionary past, such as a rat learning where to find food or water.<ref name = "LearningG8"/> Learning capacities sometimes demonstrate differences between the sexes.<ref name = "LearningG8"/> In many animal species, for example, males can solve spatial problem faster and more accurately than females, due to the effects of male hormones during development.<ref name = "LearningG8"/> The same might be true of humans.<ref name = "LearningG8"/>
 
====Emotion and motivation====
{{Main|Evolution of emotion}}
Motivations direct and energize behavior, while emotions provide the affective component to motivation, positive or negative.<ref name = "Gaulin 6">Gaulin and McBurney 2003 pp. 121–42.</ref> In the early 1970s, [[Paul Ekman]] and colleagues began a line of research which suggests that many emotions are universal.<ref name = "Gaulin 6"/> He found evidence that humans share at least five basic emotions: fear, sadness, happiness, anger, and disgust.<ref name = "Gaulin 6"/> Social emotions evidently evolved to motivate social behaviors that were adaptive in the EEA.<ref name = "Gaulin 6"/> For example, spite seems to work against the individual but it can establish an individual's reputation as someone to be feared.<ref name = "Gaulin 6"/> Shame and pride can motivate behaviors that help one maintain one's standing in a community, and self-esteem is one's estimate of one's status.<ref name = "moralanimal"/><ref name = "Gaulin 6"/>
Motivation has a neurobiologial basis in the [[reward system]] of the brain. Recently, it has been suggested that reward systems may evolve in such a way that there may be an [[inherent]] or unavoidable [[trade-off]] in the motivational system for activities of short versus long duration.<ref>Belke, T. W., and [[Theodore Garland, Jr.|T. Garland, Jr.]] 2007. A brief [[opportunity]] to run does not function as a [[reinforcer]] for [[mice]] [[Selection experiment|selected]] for high daily [[Hamster wheel|wheel-running]] rates. [[Journal of the Experimental Analysis of Behavior]] 88:199-213.</ref>
 
====Cognition====
Cognition refers to internal representations of the world and internal information processing.  From an EP perspective, cognition is not "general purpose," but uses heuristics, or strategies, that generally increase the likelihood of solving problems that the ancestors of present day humans routinely faced.  For example, present day humans are far more likely to solve logic problems that involve detecting cheating (a common problem given humans' social nature) than the same logic problem put in purely abstract terms.<ref name = "Gaulin 7">Gaulin and McBurney 2003 Chapter 7.</ref> Since the ancestors of present day humans did not encounter truly random events, present day humans may be cognitively predisposed to incorrectly identify patterns in random sequences. "Gamblers' Fallacy" is one example of this.  Gamblers may falsely believe that they have hit a "lucky streak" even when each outcome is actually random and independent of previous trials.  Most people believe that if a fair coin has been flipped 9 times and Heads appears each time, that on the tenth flip, there is a greater than 50% chance of getting Tails.<ref name = "Gaulin 6"/> Humans find it far easier to make diagnoses or predictions using frequency data than when the same information is presented as probabilities or percentages, presumably because the ancestors of present day humans lived in relatively small tribes (usually with fewer than 150 people) where frequency information was more readily available.<ref name = "Gaulin 6"/>
 
==== Personality ====
Evolutionary psychology is primarily interested in finding commonalities between people, or basic human psychological nature. From an evolutionary perspective, the fact that people have fundamental differences in personality traits initially presents something of a puzzle.<ref name = "Gaulin 9">Gaulin and McBurney 2003 Chapter 9.</ref> (Note: The field of behavioral genetics is concerned with statistically partitioning differences between people into genetic and environmental sources of variance.  However, understanding the concept of [[heritability]] can be tricky—heritability refers only to the differences between people, never the degree to which the traits of an individual are due to environmental or genetic factors, since traits are always a complex interweaving of both.)
 
Personality traits are conceptualized by evolutionary psychologists as due to normal variation around an optimum, or due to frequency-dependent selection, or facultative adaptations.  Like variability in height, some personality traits may simply reflect inter-individual variability around a general optimum.<ref name = "Gaulin 9"/> Or, personality traits may represent different genetically predisposed "behavioral morphs" – alternate behavioral strategies that depend on the frequency of competing behavioral strategies in the population.  For example, if most of the population is generally trusting and gullible, the behavioral morph of being a "cheater" (or, in the extreme case, a sociopath) may be advantageous.<ref>{{cite journal | doi = 10.1017/S0140525X00039595 | title = The sociobiology of sociopathy: An integrated evolutionary model | year = 2010 | last1 = Mealey | first1 = Linda | journal = [[Behavioral and Brain Sciences]] | volume = 18 | issue = 3 | pages = 523–41}}
</ref>  Finally, like many other psychological adaptations, personality traits may be facultative—sensitive to typical variations in the social environment, especially during early development.  For example, later born children are more likely than first borns to be rebellious, less conscientious and more open to new experiences, which may be advantageous to them given their particular niche in family structure.<ref>Sulloway, F. (1996).  Born to rebel. NY: Pantheon.</ref>
 
====Language====
{{See also|Evolutionary linguistics|Evolutionary psychology of language}}
 
According to [[Steven Pinker]], who builds on the work by [[Noam Chomsky]], the universal human ability to learn to talk between the ages of 1 – 4, basically without training, suggests that language acquisition is a distinctly human psychological adaptation (see, in particular, Pinker's ''[[The Language Instinct]]''). Pinker and [[Paul Bloom (psychologist)|Bloom]] (1990) argue that language as a mental faculty shares many likenesses with the complex organs of the body which suggests that, like these organs, language has evolved as an adaptation, since this is the only known mechanism by which such complex organs can develop.<ref>{{cite journal | last1=Pinker |first1= S. |last2= Bloom |first2= P. |year=1990 |title= Natural language and natural selection |journal= [[Behavioral and Brain Sciences]] |volume= 13 |issue=4|pages= 707–27 | doi = 10.1017/S0140525X00081061 |id = {{citeseerx|10.1.1.116.4044}} }}</ref>
 
Pinker follows Chomsky in arguing that the fact that children can learn any human language with no explicit instruction suggests that language, including most of grammar, is basically innate and that it only needs to be activated by interaction. Chomsky himself does not believe language to have evolved as an adaptation, but suggests that it likely evolved as a byproduct of some other adaptation, a so-called [[Spandrel (biology)|spandrel]]. But Pinker and Bloom argue that the organic nature of language strongly suggests that it has an adaptational origin.<ref>Workman, Lance and Will Reader (2004) Evolutionary psychology: an introduction. Cambridge University Press p. 259</ref>
 
Evolutionary psychologists hold that the [[FOXP2]] gene may well be associated with the evolution of human language.<ref name = "10WR">Workman, Lance and Will Reader (2008). Evolutionary psychology: an introduction. 2nd Ed. Cambridge University Press. Chapter 10.</ref> In the 1980s, psycholinguist Myrna Gropnik identified a dominant gene that causes language impairment in the [[KE family]] of Britain.<ref name = "10WR"/> This gene turned out to be a mutation of the FOXP2 gene.<ref name = "10WR"/> Humans have a unique allele of this gene, which has otherwise been closely conserved through most of mammalian evolutionary history.<ref name = "10WR"/> This unique allele seems to have first appeared between 100 and 200 thousand years ago, and it is now all but universal in humans.<ref name = "10WR"/> However, the once-popular idea that FOXP2 is a 'grammar gene' or that it triggered the emergence of language in ''Homo sapiens'' is now widely discredited.<ref>Diller, K. C. and R. L. Cann 2009. Evidence against a genetic-based revolution in language 50,000 years ago. In R. Botha and C. Knight (eds), ''The Cradle of Language.'' Oxford: Oxford University Press, pp. 135–49.</ref>
 
Currently several competing theories about the evolutionary origin of language coexist, none of them having achieved a general consensus.<ref name="W&R 2008:277">Workman & Reader 2008:277 "There are a number of hypotheses suggesting that language evolved to fulfil a social function such as social grooming (to bind large groups together), the making of social contracts (to enable monogamy and male provisioning) and the use of language to impress potential mates. While each of these hypotheses has its merits, each is still highly speculative and requires more evidence from different areas of research (such as linguistics and anthropology)."</ref> Researchers of language acquisition in primates and humans such as [[Michael Tomasello]] and [[Talmy Givón]], argue that the innatist framework has understated the role of imitation in learning and that it is not at all necessary to posit the existence of an innate grammar module to explain human language acquisition. Tomasello argues that studies of how children and primates actually acquire communicative skills suggests that humans learn complex behavior through experience, so that instead of a module specifically dedicated to language acquisition, language is acquired by the same cognitive mechanisms that are used to acquire all other kinds of socially transmitted behavior.<ref>Workman, Lance and Will Reader (2004) Evolutionary psychology: an introduction. Cambridge University Press p. 267</ref>
 
On the issue of whether language is best seen as having evolved as an adaptation or as a spandrel, evolutionary biologist [[W. Tecumseh Fitch]], following [[Stephen J. Gould]], argues that it is unwarranted to assume that every aspect of language is an adaptation, or that language as a whole is an adaptation. He criticizes some strands of evolutionary psychology for suggesting a pan-adaptionist view of evolution, and dismisses Pinker and Bloom's question of whether "Language has evolved as an adaptation" as being misleading. He argues instead that from a biological viewpoint the evolutionary origins of language is best conceptualized as being the probable result of a convergence of many separate adaptations into a complex system.<ref>W. Tecumseh Fitch (2010) The Evolution of Language. Cambridge University Press pp. 65–66</ref> A similar argument is made by [[Terrence Deacon]] who in ''[[The Symbolic Species]]'' argues that the different features of language have co-evolved with the evolution of the mind and that the ability to use symbolic communication is integrated in all other cognitive processes.<ref>Deacon, Terrence W. (1997) The Symbolic Species: The Co-evolution of Language and the Brain. W.W. Norton & Co</ref>
 
If the theory that language could have evolved as a single adaptation is accepted, the question becomes which of its many functions has been the basis of adaptation, several evolutionary hypotheses have been posited: that it evolved for the purpose of social grooming, that it evolved to as a way to show mating potential or that it evolved to form social contracts. Evolutionary psychologists recognize that these theories are all speculative and that much more evidence is required to understand how language might have been selectively adapted.<ref>Workman, Lance and Will Reader (2004) Evolutionary psychology: an introduction. Cambridge University Press p. 277</ref>
 
===Mating===
Given that sexual reproduction is the means by which genes are propagated into future generations, sexual selection plays a large role human evolution.  Human [[mating]], then, is of interest to evolutionary psychologists who aim to investigate evolved mechanisms to attract and secure mates.<ref>Wilson, G.D. Love and Instinct. London: Temple Smith, 1981.</ref> Several lines of research have stemmed from this interest, such as studies of mate selection<ref>Buss 1994</ref><ref>Buss & Barnes 1986</ref><ref>{{cite journal | last1 = Li | first1 = N. P. | last2 = Bailey | first2 = J. M. | last3 = Kenrick | first3 = D. T. | last4 = Linsenmeier | first4 = J. A. W. | year = 2002 | title = The necessities and luxuries of mate preferences: Testing the tradeoffs | url = http://www.psych.northwestern.edu/psych/people/faculty/bailey/Publications/Li%20et%20al.,%202002.pdf | format = PDF | journal = Journal of Personality and Social Psychology | volume = 6 | issue = 6| pages = 947–55 | pmid=12051582 | doi=10.1037/0022-3514.82.6.947}}</ref> mate poaching,<ref>Schmitt and Buss 2001</ref> mate retention,<ref>Buss 1988.</ref> [[mating preferences]]<ref>Shackelford, Schmitt, & Buss (2005) Universal dimensions of human mate preferences; ''Personality and Individual Differences 39''</ref> and [[sexual conflict|conflict between the sexes]].<ref>{{cite book |title= Evolutionary Psychology: The New Science of the Mind|last= Buss|first= David M.|authorlink= |coauthors= |year= 2008|publisher= Omegatype Typography, Inc.|location= Boston, MA|isbn= 0-205-48338-0|page= iv}}</ref>
 
Much of the research on human mating is based on parental investment theory,<ref>Trivers, R. (1972). Parental investment and sexual selection. In B. Campbell (Ed.), ''Sexual Selection and the Descent of Man''. Chicago: Aldine-Atherton.</ref> which makes important predictions about the different strategies men and women will use in the mating domain (see above under "Middle-level evolutionary theories").  In essence, it predicts that women will be more selective when choosing mates, whereas men will not, especially under short-term mating conditions. While some other scientists such as Tim Brikhead assert that promiscuity can have benefits to women, such as fertility insurance, trading up to better genes, reducing risk of inbreeding, and insurance protection of her offspring.<ref>http://www.guardian.co.uk/uk/2000/sep/03/anthonybrowne.theobserver</ref> Sarah Blaffer-Hrdy asserts that female chimpanzees, bonobos and langur monkeys, and probably human women have seemingly indiscriminate sexuality, and that being selective is biologically less advantageous than being promiscuous.<ref>http://www.citrona.com/hrdy/documents/findingmrright.pdf</ref> This has led some researchers to predict sex differences in such domains as [[sexual jealousy]],<ref>Buss 1989</ref><ref>Buss et al. 1992</ref> wherein females will react more aversively to emotional infidelity and males will react more aversively to sexual infidelity.  This particular pattern is predicted because the costs involved in mating for each sex are distinct.  Women, on average, should prefer a mate who can offer resources (e.g., financial, commitment), thus, a woman risks losing such resources with a mate who commits emotional infidelity. Men, on the other hand, are never certain of the genetic paternity of their children because they do not bear the offspring themselves ("paternity insecurity").  This suggests that for men sexual infidelity would generally be more aversive than emotional infidelity because investing resources in another man's offspring does not lead to propagation of their own genes.<ref>Kalat, J. W. (2013). Biological Psychology (11th ed.). Cengage Learning. ISBN 9781111831004.</ref>
 
Another interesting line of research is that which examines women's mate preferences across the [[ovulation|ovulatory cycle]].<ref>{{cite journal | last1 = Haselton | first1 = M. G. | last2 = Miller | first2 = G. F. | year = 2006 | title = Women's fertility across the cycle increases the short-term attractiveness of creative intelligence | url = http://www.sscnet.ucla.edu/comm/haselton/webdocs/haseltonmiller.pdf | format = PDF | journal = Human Nature | volume = 17 | issue = 1| pages = 50–73 | doi = 10.1007/s12110-006-1020-0 }}</ref><ref>{{cite journal | last1 = Gangestad | first1 = S. W. | last2 = Simpson | first2 = J. A. | last3 = Cousins | first3 = A. J. | last4 = Garver-Apgar | first4 = C. E. | last5 = Christensen | first5 = P. N. | year = 2004 | title = Women's preferences for male behavioral displays change across the menstrual cycle | url = http://faculty.oxy.edu/clint/evolution/articles/Women%E2%80%99s%20Preferences%20for%20Male%20behavioral%20display%20change%20across%20the%20menstrual%20cycle.pdf | format = PDF | journal = Psychological Science | volume = 15 | issue = 3| pages = 203–07 | doi = 10.1111/j.0956-7976.2004.01503010.x | pmid = 15016293 }}</ref>  The theoretical underpinning of this research is that ancestral women would have evolved mechanisms to select mates with certain traits depending on their hormonal status.  For example, the theory hypothesizes that, during the ovulatory phase of a woman's cycle (approximately days 10–15 of a woman's cycle),<ref>{{cite journal | last1 = Wilcox | first1 = A. J. | last2 = Dunson | first2 = D. B. | last3 = Weinberg | first3 = C. R. | last4 = Trussell | first4 = J. | last5 = Baird | first5 = D. D. | year = 2001 | title = Likelihood of conception with a single act of intercourse:  Providing benchmark rates for assessment of post-coital contraceptives | url = | journal = Contraception | volume = 63 | issue = 4| pages = 211–15 | doi = 10.1016/S0010-7824(01)00191-3 | pmid = 11376648 }}</ref> a woman who mated with a male with high genetic quality would have been more likely, on average, to produce and rear a healthy offspring than a woman who mated with a male with low genetic quality.  These putative preferences are predicted to be especially apparent for short-term mating domains because a potential male mate would only be offering genes to a potential offspring.  This hypothesis allows researchers to examine whether women select mates who have characteristics that indicate high genetic quality during the high fertility phase of their ovulatory cycles.  Indeed, studies have shown that women's preferences vary across the ovulatory cycle.  In particular, Haselton and Miller (2006) showed that highly fertile women prefer creative but poor men as short-term mates.  Creativity may be a proxy for good genes.<ref>Miller, G. F. (2000b) ''The mating mind:  How sexual choice shaped the evolution of human nature''. Anchor Books:  New York.</ref>  Research by Gangestad et al. (2004) indicates that highly fertile women prefer men who display social presence and intrasexual competition; these traits may act as cues that would help women predict which men may have, or would be able to acquire, resources.
 
===Parenting===
{{Main|Evolutionary psychology of parenting}}
 
Reproduction is always costly for women, and can also be for men. Individuals are limited in the degree to which they can devote time and resources to producing and raising their young, and such expenditure may also be detrimental to their future condition, survival and further reproductive output.
Parental investment is any parental expenditure (time, energy etc.) that benefits one [[offspring]] at a cost to parents' ability to invest in other components of fitness (Clutton-Brock 1991: 9; Trivers 1972). Components of fitness (Beatty 1992) include the well being of existing offspring, parents' future [[sexual reproduction|reproduction]], and inclusive fitness through aid to kin ([[W. D. Hamilton|Hamilton]], 1964).  Parental investment theory is a branch of life history theory.
 
Robert Trivers' theory of parental investment predicts that the sex making the largest investment in [[lactation]], nurturing and protecting offspring will be more discriminating in mating and that the sex that invests less in offspring will compete for access to the higher investing sex (see [[Bateman's principle]]).<ref>{{cite doi|10.1038/hdy.1948.21}}</ref> Sex differences in parental effort are important in determining the strength of sexual selection.
 
The benefits of parental investment to the offspring are large and are associated with the effects on condition, growth, survival and ultimately, on reproductive success of the offspring. However, these benefits can come at the cost of parent's ability to reproduce in the future e.g. through the increased risk of injury when defending offspring against predators, the loss of mating opportunities whilst rearing offspring and an increase in the time to the next reproduction.  Overall, parents are [[selection|selected]] to maximize the difference between the benefits and the costs, and parental care will be likely to evolve when the benefits exceed the costs.
 
The [[Cinderella effect]] is an alleged high incidence of stepchildren being physically, emotionally or sexually abused, neglected, murdered, or otherwise mistreated at the hands of their stepparents at significantly higher rates than their genetic counterparts. It takes its name from the fairy tale character Cinderella, who in the story was cruelly mistreated by her stepmother and stepsisters.<ref>Daly, Matin, and Margo I. Wilson. (1999)</ref>  Daly and Wilson (1996) noted: "Evolutionary thinking led to the discovery of the most important risk factor for child homicide – the presence of a stepparent. Parental efforts and investments are valuable resources, and selection favors those parental psyches that allocate effort effectively to promote fitness. The adaptive problems that challenge parental decision making include both the accurate identification of one's offspring and the allocation of one's resources among them with sensitivity to their needs and abilities to convert parental investment into fitness increments…. Stepchildren were seldom or never so valuable to one's expected fitness as one's own offspring would be, and those parental psyches that were easily parasitized by just any appealing youngster must always have incurred a selective disadvantage"(Daly & Wilson, 1996, pp.&nbsp;64–65).  However, they note that not all stepparents will "want" to abuse their partner's children, or that genetic parenthood is any insurance against abuse. They see step parental care as primarily "mating effort" towards the genetic parent.<ref name="Daly_Wilson_98">Daly & Wilson 1998</ref>
 
===Family and kin===
Inclusive fitness is the sum of an organism's classical fitness (how many of its own offspring it produces and supports) and the number of equivalents of its own offspring it can add to the population by supporting others.<ref>[http://www.personalityresearch.org/evolutionary/inclusive.html Definition and explanation of inclusive fitness from Personality Research.org]</ref>  The first component is called classical fitness by Hamilton (1964).
 
From the gene's point of view, evolutionary success ultimately depends on leaving behind the maximum number of copies of itself in the population. Until 1964, it was generally believed that genes only achieved this by causing the individual to leave the maximum number of viable offspring. However, in 1964 W. D. Hamilton proved mathematically that, because close relatives of an organism share some identical genes, a gene can also increase its evolutionary success by promoting the reproduction and survival of these related or otherwise similar individuals. Hamilton claimed that this leads natural selection to favor organisms that would behave in ways that maximize their inclusive fitness. It is also true that natural selection favors behavior that maximizes personal fitness.
 
Hamilton's rule describes mathematically whether or not a gene for altruistic behavior will spread in a population:
:<math>rb > c \ </math>
where
* <math>c \ </math> is the reproductive cost to the altruist,
* <math>b \ </math> is the reproductive benefit to the recipient of the altruistic behavior, and
* <math>r \ </math> is the probability, above the population average, of the individuals sharing an altruistic gene – commonly viewed as "degree of relatedness".
 
The concept serves to explain how natural selection can perpetuate altruism. If there is an '"altruism gene"' (or complex of genes) that influences an organism's behavior to be helpful and protective of relatives and their offspring, this behavior also increases the proportion of the altruism gene in the population, because relatives are likely to share genes with the altruist due to [[identical by descent|common descent]]. Altruists may also have some way to recognize altruistic behavior in unrelated individuals and be inclined to support them. As Dawkins points out in ''The Selfish Gene'' (Chapter 6) and ''The Extended Phenotype'',<ref>Dawkins, Richard, "The Extended Phenotype", Oxford University Press 1982 (Chapter 9)</ref> this must be distinguished from the [[green-beard effect]].
 
Although it is generally true that humans tend to be more altruistic toward their kin than toward non-kin, the relevant proximate mechanisms that mediate this cooperation have been debated (see [[kin recognition]]), with some arguing that kin status is determined primarily via social and cultural factors (such as co-residence, maternal association of sibs, etc.),<ref name="W2010">{{cite journal | doi = 10.1016/j.evolhumbehav.2010.08.001 | title = Sixteen common misconceptions about the evolution of cooperation in humans | year = 2011 | last1 = West | first1 = Stuart A. | last2 = El Mouden | first2 = Claire | last3 = Gardner | first3 = Andy | journal = Evolution and Human Behavior | volume = 32 | issue = 4 | pages = 231–62 }}</ref> while others have argued that kin recognition can also mediated by biological factors such as facial resemblance and immunogenetic similarity of the major histocompatibility complex (MHC).<ref>Villinger, J.,  and Waldman, B. (2012).  Social discrimination by quantitative assessment of immunogenetic similarity.  Published online before print September 5, 2012, {{DOI|10.1098/rspb.2012.1279}} Proc. R. Soc. B</ref>  For a discussion of the interaction of these social and biological kin recognition factors see Lieberman, Tooby, and Cosmides (2007)<ref>Lieberman, D.,  Tooby, J. & Cosmides, L.  The architecture of human kin detection Nature 445, 727–31 (15 February 2007) | {{DOI|10.1038/nature05510}}</ref> ([http://www.psych.ucsb.edu/research/cep/papers/kinnature05510.pdf PDF]).
 
Whatever the proximate mechanisms of kin recognition there is substantial evidence that humans act generally more altruistically to close genetic kin compared to genetic non-kin.<ref name="ReferenceA">Buss, D.M. (2011). Evolutionary Psychology.  Monterey: Brooks-Cole.</ref><ref name="Gaulin 2004">Gaulin & McBurney (2004), Evolutionary Psychology, 2nd Ed. NY: Prentice Hall</ref><ref>Workman & Reader (2008), Evolutionary Psychology, 2nd Ed. Cambridge: Cambridge University Press</ref>
 
===Interactions with non-kin / reciprocity===
Although interactions with non-kin are generally less altruistic compared to those with kin, cooperation can be maintained with non-kin via mutually beneficial reciprocity as was proposed by Robert Trivers.<ref name="Trivers1971" />  If there are repeated encounters between the same two players in an evolutionary game in which each of them can choose either to "cooperate" or "defect," then a strategy of mutual cooperation may be favored even if it pays each player, in the short term, to defect when the other cooperates. Direct reciprocity can lead to the evolution of cooperation only if the probability, w, of another encounter between the same two individuals exceeds the cost-to-benefit ratio of the altruistic act:
: w > c/b
 
Reciprocity can also be indirect if information about previous interactions is shared.  Reputation allows evolution of cooperation by indirect reciprocity. Natural selection favors strategies that base the decision to help on the reputation of the recipient: studies show that people who are more helpful are more likely to receive help. The calculations of indirect reciprocity are complicated and only a tiny fraction of this universe has been uncovered, but again a simple rule has emerged.<ref>{{cite journal | pmid = 9634232 | year = 1998 | last1 = Nowak | first1 = MA | last2 = Sigmund | first2 = K | title = Evolution of indirect reciprocity by image scoring | volume = 393 | issue = 6685 | pages = 573–77 | doi = 10.1038/31225 | journal = Nature |authorlink1=Martin Nowak |authorlink2=Karl Sigmund }}</ref> Indirect reciprocity can only promote cooperation if the probability, q, of knowing someone’s reputation exceeds the cost-to-benefit ratio of the altruistic act:
: q > c/b
 
One important problem with this explanation is that individuals may be able to evolve the capacity to obscure their reputation, reducing the probability, q, that it will be known.<ref>{{cite journal | doi = 10.1038/nature04201 | title = Human cooperation: Second-order free-riding problem solved? | last1 = Fowler | first1 = James H. | journal = Nature | volume = 437 | issue = 7058 | pages = E8; discussion E8–9 |authorlink1=James H. Fowler|date=22 September 2005 | pmid=16177738}}</ref>
 
Trivers argues that friendship and various social emotions evolved in order to manage reciprocity.<ref name="Gaulin, Steven J. C 2003. pp. 323–52">Gaulin, Steven J. C. and Donald H. McBurney. Evolutionary Psychology. Prentice Hall. 2003. ISBN 978-0-13-111529-3, Chapter 14, pp. 323–52.</ref> Liking and disliking, he says, evolved to help present day humans' ancestors form coalitions with others who reciprocated and to exclude those who did not reciprocate.<ref name="Gaulin, Steven J. C 2003. pp. 323–52"/> Moral indignation may have evolved to prevent one's altruism from being exploited by cheaters, and gratitude may have motivated present day humans' ancestors to reciprocate appropriately after benefiting from others' altruism.<ref name="Gaulin, Steven J. C 2003. pp. 323–52"/> Likewise, present day humans feel guilty when they fail to reciprocate.<ref name="Gaulin, Steven J. C 2003. pp. 323–52"/> These social motivations match what evolutionary psychologists expect to see in adaptations that evolved to maximize the  benefits and minimize the drawbacks of reciprocity.<ref name="Gaulin, Steven J. C 2003. pp. 323–52"/>
 
Evolutionary psychologists say that humans have psychological adaptations that evolved specifically to help us identify nonreciprocators, commonly referred to as "cheaters."<ref name="Gaulin, Steven J. C 2003. pp. 323–52"/> In 1993, Robert Frank and his associates found that participants in a prisoner's dilemma scenario were often able to predict whether their partners would "cheat," based on a half hour of unstructured social interaction.<ref name="Gaulin, Steven J. C 2003. pp. 323–52"/> In a 1996 experiment, for example, Linda Mealey and her colleagues found that people were better at remembering the faces of people when those faces were associated with stories about those individuals cheating (such as embezzling money from a church).<ref name="Gaulin, Steven J. C 2003. pp. 323–52"/>
 
===Evolution and culture===
 
Evolutionary psychology incorporates insights derived from other disciplines about how cultural phenomena evolve over time. Theories that have applied evolutionary perspectives to cultural phenomena include [[memetics]], [[cultural ecology]], and dual inheritance theory (gene-culture co-evolution).<ref>Workman, Lance and Will Reader (2004) Evolutionary psychology: an introduction. Cambridge University Press, Chapter 13.</ref>
 
Memetics is a theory of mental content based on an analogy with evolution, originating from [[Richard Dawkins]]' 1976 book ''[[The Selfish Gene]].'' It purports to be an approach to [[evolutionary model]]s of cultural [[information transfer]]. A [[meme]], analogous to a [[gene]], is essentially a "unit of culture"—an idea, belief, pattern of behavior, etc. which is "hosted" in one or more individual minds, and which can reproduce itself from mind to mind. Thus what would otherwise be regarded as one individual influencing another to adopt a belief is seen memetically as a meme reproducing itself. As with genetics, particularly under Dawkins's interpretation, a meme's success may be due to its contribution to the effectiveness of its host. Memetics is notable for sidestepping the traditional concern with the ''[[truth]]'' of ideas and beliefs.
 
[[Susan Blackmore]] (2002) re-stated the definition of meme as: whatever is copied from one person to another person, whether habits, skills, songs, stories, or any other kind of information. Further she said that memes, like genes, are replicators in the sense as defined by Dawkins.<ref>[[Richard Dawkins|Dawkins, R.]] (1982) [http://www.stephenjaygould.org/library/dawkins_replicators.html "Replicators and Vehicles"] King's College Sociobiology Group, eds., ''Current Problems in Sociobiology'', Cambridge, Cambridge University Press, pp.&nbsp;45–64. "A replicator may be defined as any entity in the universe of which copies are made."</ref> That is, they are information that is copied. Memes are copied by [[imitation]], teaching and other methods. The copies are not perfect: memes are copied with variation; moreover, memes compete for humans' limited memory capacity and for the chance to be copied again. Only some of the variants can survive. The combination of these three elements (copies; variation; competition for survival) forms precisely the condition for [[Darwinian evolution]], and so memes (and hence human cultures) evolve. Large groups of memes that are copied and passed on together are called [[co-adapted]] meme complexes, or ''memeplexes''. In her definition, the way that a meme replicates is through imitation.
 
Dual inheritance theory (DIT), also known as gene-culture coevolution, suggests that cultural information and genes co-evolve. [[Marcus Feldman]] and [[Luigi Luca Cavalli-Sforza]] (1976) published perhaps the first dynamic models of gene-culture coevolution.<ref>{{cite journal | last1 = Feldman | first1 = M. | last2 = Cavalli-Sforza | first2 = L. | author-separator =, | author-name-separator= | year = 1976 | title = Cultural and biological evolutionary processes, selection for a trait under complex transmission | url = | journal = Theoretical Population Biology | volume = 9 | issue = 2| pages = 238–59 | doi = 10.1016/0040-5809(76)90047-2 | pmid = 1273802 }}</ref>  These models were to form the basis for subsequent work on DIT, heralded by the publication of three seminal books in 1980 and 1981. Charles Lumsden and [[E. O. Wilson|E.O. Wilson's]] ''Genes, Mind and Culture'' (1981).<ref>Lumsden C., and E. Wilson.  1981.  ''Genes, Mind and Culture: The Coevolutionary Process.''  Cambridge, MA: Harvard University Press.</ref> also outlined a series of mathematical models of how genetic evolution might favor the selection of cultural traits and how cultural traits might, in turn, affect the speed of genetic evolution. Another 1981 book relevant to this topic was Cavalli-Sforza and Feldman's ''Cultural Transmission and Evolution: A Quantitative Approach''.<ref>Cavalli-Sfornza, L. and M. Feldman. 1981.  ''Cultural Transmission and Evolution: A Quantitative Approach''.  Princeton, New Jersey: Princeton University Press.</ref>  Borrowing heavily from [[population genetics]] and [[epidemiology]], this book built a mathematical theory concerning the spread of cultural traits. It describes the evolutionary implications of [[vertical transmission]], passing cultural traits from parents to offspring; oblique transmission, passing cultural traits from any member of an older generation to a younger generation; and [[horizontal transmission]], passing traits between members of the same population.
 
[[Robert Boyd (anthropologist)|Robert Boyd]] and [[Peter Richerson]]'s (1985) ''Culture and the Evolutionary Process'' presents models of the evolution of social learning under different environmental conditions, the population effects of social learning, various forces of selection on cultural learning rules, different forms of biased transmission and their population-level effects, and conflicts between cultural and genetic evolution.
 
Along with [[game theory]], [[Herbert Gintis]] suggested that Dual inheritance theory has potential for unifying the behavioral sciences, including economics, biology, anthropology, sociology, psychology and political science because it addresses both the genetic and cultural components of human inheritance.<ref>{{cite journal | last1 = Gintis | first1 = H. | year = 2006 | title = A framework for the integration of the behavioral sciences | url = http://www.umass.edu/preferen/gintis/Unity-BBS%20Print%20Version.pdf| journal = [[Behavioral and Brain Sciences]] | volume = 30 | pages = 1–61 }}</ref>  Laland and Brown hold a similar view.{{Citation needed|date=March 2011}}
 
==In psychology sub-fields==
 
===Developmental psychology===
{{Main|Evolutionary developmental psychology}}
 
According to [[Paul Baltes]], the benefits granted by evolutionary selection decrease with age. Natural selection has not eliminated many harmful conditions and nonadaptive characteristics that appear among older adults, such as [[Alzheimer disease]]. If it were a disease that killed 20 year-olds instead of 70 year-olds this may have been a disease that natural selection could have eliminated ages ago. Thus, unaided by evolutionary pressures against nonadaptive conditions, modern humans suffer the aches, pains, and infirmities of aging and as the benefits of evolutionary selection decrease with age, the need for culture increases.<ref>Santrock, W. John (2005). A Topical Approach to Life-Span Development (3rd ed.). New York, NY: McGraw-Hill. p. 62.</ref>
 
===Social psychology===
As humans are a highly social species, there are many adaptive problems associated with navigating the social world (e.g., maintaining allies, managing hierarchies, interacting with outgroup members). Researchers in the emerging field of evolutionary social psychology have made many discoveries pertaining to topics traditionally studied by social psychologists, including person perception, social cognition, attitudes, altruism, emotions, group dynamics, leadership, motivation, prejudice, intergroup relations, and cross-cultural differences.<ref>Neuberg, S. L., Kenrick, D. T., & Schaller, M. (2010). Evolutionary social psychology. In S. T. Fiske, D. T. Gilbert, & G. Lindzey (Eds.), Handbook of social psychology (5th Edition, Vol. 2, pp. 761–796). New York: John Wiley & Sons.</ref><ref>Schaller, M., Simpson, J. A., & Kenrick, D. T. (Eds.) (2006). Evolution and social psychology. New York: Psychology Press.</ref><ref>{{cite journal | doi = 10.1037/1089-2699.12.1.1 | title = Evolutionary approaches to group dynamics: An introduction | year = 2008 | last1 = Van Vugt | first1 = Mark | last2 = Schaller | first2 = Mark | journal = Group Dynamics: Theory, Research, and Practice | volume = 12 | pages = 1–6 }}</ref>
 
===Abnormal psychology===
Adaptationist hypotheses regarding the etiology of psychological disorders are often based on analogies between physiological and psychological dysfunctions,<ref>{{cite book| last1=[[Randolph M. Nesse|Nesse]] |first1=R | last2=[[George C. Williams|Williams]] |first2=George C. |title=Why We Get Sick |year=1996 |publisher=Vintage |location=NY}} (adaptationist perspective to both physiological and psychological dysfunctions)</ref> as noted in the table below.  Prominent theorists and [[Evolutionary medicine#Evolutionary psychiatry / Clinical evolutionary psychology|evolutionary psychiatrists]] include [[Michael T. McGuire]] and [[Randolph M. Nesse]].  They, and others, suggest that mental disorders are due to the interactive effects of both nature and nurture, and often have multiple contributing causes.<ref name="Gaulin, Steven J. C 2003. pp. 1–24"/>
 
{| class="wikitable"
|-
! colspan="3" | Possible Causes of Psychological 'Abnormalities' from an Adaptationist Perspective  <br>
Summary based on information in these textbooks (all titled "Evolutionary Psychology"): Buss (2011),<ref name="ReferenceA"/> Gaulin & McBurney (2004),<ref name="Gaulin 2004"/> Workman & Reader (2008)<ref>Workman & Reader (2008), Evolutionary Psychology, 2nd Ed. Cambridge: Cambridge University Press,</ref> as well as Cosmides & Tooby (1999) ''Toward an evolutionary taxonomy of treatable conditions ''<ref>{{cite journal | last1 = Cosmides | first1 = L. | last2 = Tooby | first2 = J. | year = 1999 | title = Toward an evolutionary taxonomy of treatable conditions | url = | journal = Journal of Abnormal Psychology | volume = 108 | issue = 3| pages = 453–64 | doi = 10.1037/0021-843X.108.3.453 | pmid = 10466269 }}</ref>
|-
| ''' Causal mechanism of failure or malfunction of adaptation ''' || '''Physiological Example''' || '''Hypothesized Psychological Example'''
|-
| '''Functioning adaptation (adaptive defense)''' || Fever / Vomiting <p>(functional responses to infection or ingestion of toxins)|| Mild depression or anxiety <p>(functional responses to mild loss or stress <ref name="ncbi.nlm.nih.gov">Andrews, P. W. & Thomson, J. A. (2009).  [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2734449/ The bright side of being blue: Depression as an adaptation for analyzing complex problems] Psychol Rev. 2009 July; 116(3): 620-654. doi:  10.1037/a0016242</ref>/ reduction of social interactions to prevent infection by contagious pathogens) <ref>Raison, C.L, Miller, A. N. (2012).  The evolutionary significance of depression in Pathogen Host Defense (PATHOS-D) Molecular Psychiatry  1–23.  [http://www.nature.com/mp/journal/vaop/ncurrent/pdf/mp20122a.pdf PDF].</ref>
|-
|'''By-product of an adaptation(s)''' || Intestinal gas <p>(byproduct of digestion of fiber)  ||  Sexual fetishes (?)<p>(possible byproduct of normal sexual arousal adaptations that have 'imprinted' on unusual objects or situations)
|-
| '''Adaptations with multiple effects''' || Gene for malaria resistance, in homozygous form, causes sickle cell anemia || Adaptation(s) for high levels of creativity may also predispose schizophrenia or bi-polar disorder <p>(adaptations with both positive and negative effects, perhaps dependent on alternate developmental trajectories)
|-
| '''Malfunctioning adaptation''' || Allergies<p>(over-reactive immunological responses) || Autism <p> (possible malfunctioning of [[theory of mind]] module)
|-
| '''[[Frequency-dependent selection|Frequency-dependent]] morphs''' || The two sexes / Different blood and immune system types || Personality traits and personality disorders <p>(may represent alternative behavioral strategies dependent on the frequency of the strategy in the population)
|-
| '''Mismatch between ancestral & current environments''' || Modern diet-related Type 2 Diabetes || More frequent modern interaction with strangers (compared to family and close friends) may predispose greater incidence of depression & anxiety
|-
| '''Tails of normal (bell shaped) curve''' || Very short or tall height || Tails of the distribution of personality traits (e.g., extremely introverted or extroverted)
|}
 
Evolutionary psychologists have suggested that schizophrenia and bipolar disorder may reflect a side-effect of genes with fitness benefits, such as increased creativity.<ref name = "Gaulin 11">Gaulin and McBurney 2003 pp. 239-56.</ref> (Some individuals with bipolar disorder are especially creative during their manic phases and the close relatives of schizophrenics have been found to be more likely to have creative professions.<ref name="Gaulin 11"/>) A 1994 report by the American Psychiatry Association found that people suffered from schizophrenia at roughly the same rate in Western and non-Western cultures, and in industrialized and pastoral societies, suggesting that schizophrenia is not a disease of civilization nor an arbitrary social invention.<ref name = "Gaulin 11"/> Sociopathy may represent an evolutionarily stable strategy, by which a small number of people who cheat on social contracts benefit in a society consisting mostly of non-sociopaths.<ref name="Gaulin, Steven J. C 2003. pp. 1–24"/>  Mild depression may be an adaptive response to withdraw from, and re-evaluate, situations that have led to disadvantageous outcomes (the "analytical rumination hypothesis") <ref name="ncbi.nlm.nih.gov"/> (see [[Evolutionary approaches to depression]]).
 
Some of these speculations have yet to be developed into fully testable hypotheses, and a great deal of research is required to confirm their validity.<ref>O’Connell, H. (2004) Evolutionary theory in psychiatry and psychology. Irish Journal of Psychological Medicine, 21 (1), pp. 37–37.</ref><ref>{{cite journal | last1 = Rose | first1 = S. | year = 2001 | title = Revisiting evolutionary psychology and psychiatry | url = | journal = The British Journal of Psychiatry | volume = 179 | pages = 558–59 |doi=10.1192/bjp.179.6.558-b | issue = 6 }}</ref>
 
===Psychology of religion===
{{Main|Evolutionary psychology of religion}}
Adaptationist perspectives on [[religious belief]] suggest that, like all behavior, religious behaviors are a product of the human brain. As with all other organ functions, [[cognition]]'s functional structure has been argued to have a genetic foundation, and is therefore subject to the effects of natural selection and sexual selection. Like other organs and tissues, this functional structure should be universally shared amongst humans and should have solved important problems of survival and reproduction in ancestral environments. However, evolutionary psychologists remain divided on whether religious belief is more likely a consequence of evolved psychological adaptations,<ref name="Sosis">{{cite journal|year=2003|title=Signaling, solidarity, and the sacred: the evolution of religious behavior|journal=Evolutionary Anthropology|issue=12|pages=264–74 |last1=Sosis |first1=R. |first2=C. |last2=Alcorta|doi=10.1002/evan.10120|volume=12}}</ref> or is a byproduct of other cognitive adaptations.<ref>{{cite journal|year=2006|title=Whence collective rituals? A cultural selection model of ritualized behavior|journal=American Anthropologist|issue=108|pages=824–27|last1=Lienard |first1=P. |first2=P. |last2=Boyer|doi=10.1525/aa.2006.108.4.814|volume=108}}</ref>
 
==Reception==
{{Main|Criticism of evolutionary psychology}}
Critics of evolutionary psychology accuse it of promoting genetic determinism, panadaptionism (the idea that all behaviors and anatomical features are adaptations), unfalsifiable hypotheses, distal or ultimate explanations of behavior when proximate explanations are superior, and malevolent political or moral ideas.<ref>Kurzban, Robert. [http://human-nature.com/nibbs/02/apd.html Alas poor evolutionary psychology]. The Human Nature Review  2002 Volume 2: 99–109 (14 March ). Retrieved 14 July 2013.</ref>
 
===Ethical implications===
Critics have argued that evolutionary psychology might be used to justify existing social hierarchies and [[reactionary]] policies.<ref>{{cite book |last1= Rose |first1= Hilary |last2= Rose |first2= Steven |editor1-first= |editor1-last= |editor1-link= |others= |title= Alas, Poor Darwin: Arguments against Evolutionary Psychology |url= |edition= |year= 2000 |publisher= Harmony Books |location= New York |isbn= 978-0-609-60513-4  |pages= 1–13 |chapter= Introduction |chapterurl= }}</ref><ref name="wilson2003">{{cite journal |last1= Wilson |first1= David Sloan |last2= Dietrich |first2= Eric |last3= Clark |first3= Anne B. |year= 2003 |title= On the inappropriate use of the naturalistic fallacy in evolutionary psychology |journal= Biology and Philosophy |volume= 18 |issue= 5 |pages= 669–81 |publisher= |doi= 10.1023/A:1026380825208 |url= http://evolution.binghamton.edu/dswilson/wp-content/uploads/2010/01/DSW14.pdf |accessdate= March 23, 2013}}</ref> It has also been suggested by critics that evolutionary psychologists' theories and interpretations of empirical data rely heavily on [[Ideology|ideological]] assumptions about race and gender.<ref>{{cite journal |last1= Caporael |first1= Linnda R. |last2= Brewer |first2= Marilynn B. |year= 1991 |title= The Quest for Human Nature: Social and Scientific Issues in Evolutionary Psychology |journal= Journal of Social Issues |volume= 47 |issue= 3 |pages= 1–9 |publisher= |doi= 10.1111/j.1540-4560.1991.tb01819.x |url= |accessdate=}}</ref> Other critics contend that some theories – for example, the authors of ''[[A Natural History of Rape]]'' view [[rape]] as a form of [[mate choice]] that enhances male [[Fitness (biology)|fitness]] – could have potentially far-reaching ethical implications.<ref name="wilson2003"/><ref>{{cite book |last1= Richardson |first1= Robert C. |authorlink1= |last2= |first2= |authorlink2= |editor1-first= |editor1-last= |editor1-link= |others= |title= Evolutionary Psychology As Maladapted Psychology |url= http://books.google.com/books?id=KeqiKNFa3YgC&pg=PA36 |edition= |year= 2007 |publisher= [[MIT Press]] |location= Cambridge, Mass. |isbn= 978-0-262-18260-7 |page= 36  |chapter= |chapterurl= }}</ref>
 
In response to such criticism, evolutionary psychologists often caution against committing the  [[naturalistic fallacy]] – the assumption that "what is natural" is necessarily a moral good.<ref name="wilson2003"/><ref name="Pinker">Pinker, S. (2003). The blank slate. NY: Penguin</ref>{{page needed|date=April 2013}}<ref name="Levy"/> However, their caution against committing the  naturalistic fallacy has been criticized by Wilson, et al. (2003) as fallacious and a means to stifle legitimate ethical discussions.<ref name="wilson2003"/>
 
===Standard social science model===
{{Main|Standard social science model}}
Evolutionary psychology has been entangled in the larger philosophical and social science controversies related to the debate on [[nature and nurture]]. Evolutionary psychologists typically contrast evolutionary psychology with what they call the standard social science model (SSSM). They characterize the SSSM as the "[[blank slate]]," [[Social constructionism|social constructionist]], or "[[Cultural determinism|cultural determinist]]" perspective that they claim dominated the [[social science]]s throughout the 20th century and assumed that the mind was shaped almost entirely by culture.<ref name="Pinker"/>
 
Critics have argued that evolutionary psychologists created a [[False dilemma|false dichotomy]] between their own view and the [[caricature]] of the SSSM.<ref name="Richardson">{{cite book |last1= Richardson |first1= Robert C. |authorlink1= |last2= |first2= |authorlink2= |editor1-first= |editor1-last= |editor1-link= |others= |title= Evolutionary Psychology As Maladapted Psychology |url= http://books.google.com/books?id=KeqiKNFa3YgC&pg=PA176 |edition= |year= 2007 |publisher= [[MIT Press]] |location= Cambridge, Mass. |isbn= 978-0-262-18260-7 |page= 176  |chapter= |chapterurl= }}</ref><ref>{{cite book |last= Wallace |first= Brendan |authorlink= |title= Getting Darwin Wrong: Why Evolutionary Psychology Won't Work |url= |accessdate= |year= 2010 |publisher= Imprint Academic |location= Exeter |isbn= 978-1-84540-207-5 |page= 136}}</ref><ref>{{cite book |last1= Solomon |first1= Sheldon et al. |authorlink1= |last2= |first2= |authorlink2= |editor1-first= Mark |editor1-last= Schaller |editor2-first= Christian S |editor2-last= Crandall |title= The Psychological Foundations of Culture |url= |year= 2004 |publisher= Lawrence Erlbaum Associates |location= Mahwah, N.J. |isbn= 978-0-8058-3839-8 |page= 17  |chapter= Human Awareness of Mortality and the Evolution of Culture |chapterurl= http://books.google.com/books?id=TW4cVuyEnFAC&pg=PA17 }}</ref> Other critics regard the SSSM as a [[rhetorical device]] or a [[straw man]]<ref name="Levy">{{cite journal |last1= Levy |first1= Neil |last2= |first2= |year= 2004 |title= Evolutionary Psychology, Human Universals, and the Standard Social Science Model |journal= [[Biology and Philosophy]] |volume= 19 |issue= 3 |pages= 459–72|publisher= [[Kluwer Academic Publishers]] |doi= 10.1023/B:BIPH.0000036111.64561.63 |url= http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.90.9290&rep=rep1&type=pdf |accessdate= March 18, 2013 }}</ref><ref name="Richardson"/><ref>{{cite book |last1= Sampson |first1= Geoffrey |authorlink1= Geoffrey Sampson |last2= |first2= |authorlink2= |editor1-first= |editor1-last= |editor1-link= |others= |title= The "Language Instinct" Debate: Revised Edition |url= http://books.google.com/books?id=N0zJNPuXTZMC&pg=PA134 |edition= |year= 2009 |publisher= Continuum |location= London |isbn= 978-0-8264-7384-4  |pages= 134–5 |chapter= |chapterurl= }}</ref> and suggest that the scientists whom evolutionary psychologists associate with the SSSM did not believe that the mind was a blank state devoid of any natural predispositions.<ref name="Levy"/>
 
===Reductionism and determinism===
Some critics view evolutionary psychology as a form of genetic [[Reductionism#Reductionism and science|reductionism]] and [[genetic determinism]],<ref>{{cite book |last1= Maiers |first1= Wolfgang |authorlink1= |last2= |first2= |authorlink2= |editor1-first= Niamh |editor1-last= Stephenson |editor1-link= |others= |title= Theoretical Psychology: Critical Contributions |url= |edition= |year= 2003 |publisher= Captus University Publications |location= Concord, Ont. |isbn= 978-1-55322-055-8 = |pages= 426–35 |chapter= The Bogus Claim of Evolutionary Psychology |chapterurl= http://books.google.com/books?id=uA5VIXQmYQUC&pg=PA426 }}</ref><ref name="Plotkin, Henry p. 150">Plotkin, Henry. 2004 Evolutionary thought in Psychology: A Brief History. Blackwell. p. 150.</ref> a common critique being that evolutionary psychology does not address the complexity of individual development and experience and fails to explain the influence of genes on behavior in individual cases.<ref name="EBO instinct">"instinct." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. 9 Feb 2011. [http://www.britannica.com/EBchecked/topic/289249/instinct].</ref> Evolutionary psychologists respond that EP works within a nature-nurture interactionist framework that acknowledges that many psychological adaptations are facultative (sensitive to environmental variations during individual development).  EP is generally not focused on proximate analyses of behavior  but rather its focus is on the study of distal/ultimate causality (the evolution of psychological adaptations). The field of behavioral genetics is focused on the study of the proximate influence of genes on behavior.<ref name=AmPs2010/>
 
===Testability of hypotheses===
{{See also|Just-so story}}
A frequent critique of the discipline is that the hypotheses of evolutionary psychology are frequently arbitrary and difficult or impossible to adequately test, thus questioning its status as an actual scientific discipline, for example because many current traits probably evolved to serve different functions than they do now.<ref name="Psychology"/><ref>{{cite journal |last1= Ryle |first1= Anthony |last2= |first2= |year= 2005 |title= The Relevance of Evolutionary Psychology for Psychotherapy |journal= British Journal of Psychotherapy |volume= 21 |issue= 3 |pages= 375–88 |publisher= |doi= 10.1111/j.1752-0118.2005.tb00225.x |url= |accessdate=}}</ref> While evolutionary psychology hypotheses are difficult to test, evolutionary psychologists assert that it is not impossible.<ref name="Buss, Haselton 2007. pp. 26–27">"Testing ideas about the evolutionary origins of psychological phenomena is indeed a challenging task, but not an impossible one" Buss et al. 1998; Pinker, 1997b).</ref> Part of the critique of the scientific base of evolutionary psychology includes a critique of the concept of the Environments of Evolutionary Adaptation (EEA). Some critics have argued that researchers know so little about the environment in which ''Homo sapiens'' evolved that explaining specific traits as an adaption to that environment becomes highly speculative.<ref name="Plotkin, Henry p. 149">Plotkin, Henry. 2004 Evolutionary thought in Psychology: A Brief History. Blackwell. p. 149.</ref> Evolutionary psychologists respond that they do know many things about this environment, including the facts that only women became pregnant, present day humans' ancestors were hunter-gatherers that generally lived in small tribes, etc.<ref>The Handbook of Evolutionary Psychology (2005), David M. Buss,  Chapter 1, pp. 5–67, Conceptual Foundations of Evolutionary Psychology, John Tooby and Leda Cosmides</ref>
 
===Modularity of mind===
{{Main|Modularity of mind}}
Evolutionary psychologists generally presume that, like the body, the mind is made up of many evolved modular adaptations,<ref name="Kurzban, R. 2011">{{cite book|last=Kurzban |first=Robert |year=2011 |title=Why Everyone (Else) Is a Hypocrite: Evolution and the Modular Mind |publisher=Princeton University Press |location=NJ |isbn=9780691146744}}</ref> although there is some disagreement within the discipline regarding the degree of general plasticity, or "generality," of some modules.<ref name=AmPs2010>{{cite doi|10.1037/a0018413}}</ref> It has been suggested that modularity evolves because, compared to non-modular networks, it would have conferred an advantage in terms of fitness<ref>{{cite book |last1= Cosmides |first1= Leda |authorlink1= |last2= Tooby |first2= John |authorlink2= |editor1-first= |editor1-last= |editor1-link= |others= |title= The Adapted Mind: Evolutionary Psychology and the Generation of Culture |url= |year= 1992 |publisher= Oxford University Press |location= New York |isbn=  |pages= 163–228 |chapter= Cognitive Adaptations for Social Exchange |chapterurl= }}</ref> and because connection costs are lower.<ref>{{cite journal |last1= Clune |first1= Jeff |last2= Mouret |first2= Jean-Baptiste |last3= Lipson |first3= Hod |year= 2013 |title= The evolutionary origins of modularity |journal= Proceedings of the Royal Society |volume= 280 |issue= 1755 |pages= 20122863|publisher= |doi= 10.1098/rspb.2012.2863 |arxiv= 1207.2743v1.pdf}}</ref>
 
In contrast, some academics argue that it is unnecessary to posit the existence of highly domain specific modules, and, suggest that the neural anatomy of the brain supports a model based on more domain general faculties and processes.<ref>{{cite journal | last1= Panksepp |first1= Jaak |last2= Panksepp |first2= Jules B. |year= 2000 |title= The Seven Sins of Evolutionary Psychology|journal= Evolution and Cognition |volume= 6 |issue= 2 |pages= 108–131 |url= http://www.flyfishingdevon.co.uk/salmon/year3/psy364-intro-psychobiology/panksepp_seven_sins.pdf |format= PDF |accessdate= 15 May 2012 }}</ref><ref>{{cite book |last1= Buller |first1= David J. |authorlink1= |last2= Hardcastle |first2= Valerie Gray |authorlink2= |editor1-first= David J. |editor1-last= Buller |editor1-link= |others= |title= Adapting Minds: Evolutionary Psychology And The Persistent Quest For Human Nature |url= |year= 2005 |publisher= [[MIT Press]] |location= Cambridge, Mass. |isbn= 978-0-262-02579-9  |pages= 127–201 |chapter= Modularity |chapterurl= http://books.google.com/books?id=dQ5MGDvn8eIC&pg=PA127 }}</ref> Moreover, empirical support for the domain-specific theory stems almost entirely from performance on variations of the [[Wason selection task]] which is extremely limited in scope as it only tests one subtype of deductive reasoning.<ref>{{cite journal |last1= Davies |first1= Paul Sheldon |last2= Fetzer |first2= James H. |last3= Foster |first3= Thomas R. |year= 1995 |title= Logical reasoning and domain specificity |journal= [[Biology and Philosophy]] |volume= 10 |issue= 1 |pages= 1–37 |publisher= |doi= 10.1007/BF00851985 |url= |accessdate=}}</ref><ref>{{cite book |last1= O'Brien |first1= David |authorlink1= |last2= Manfrinati |first2= Angela |authorlink2= |editor1-first= Mike |editor1-last= Oaksford |editor1-link= |editor2-last= Chater |editor2-first= Nick |title= Cognition and Conditionals: Probability and Logic in Human Thinking |url= |year= 2010 |publisher= Oxford University Press |location= New York |isbn= 978-0-19-923329-8  |pages= 39–54 |chapter= The Mental Logic Theory of Conditional Propositions |chapterurl= http://books.google.com/books?id=iQSDOqAvXIoC&pg=PA47 }}</ref>
 
===Evolutionary psychology defense===
Evolutionary psychologists have addressed many of their critics (see, for example, books by Segerstråle (2000), ''Defenders of the Truth: The Battle for Science in the Sociobiology Debate and Beyond,''<ref>Segerstråle, Ullica Christina Olofsdotter (2000). Defenders of the truth: The battle for science in the sociobiology debate and beyond. Oxford [Oxfordshire]: Oxford University Press. ISBN 0-19-850505-1.</ref> Barkow (2005), ''Missing the Revolution: Darwinism for Social Scientists,''<ref>Jerome H. Barkow, (2005), Missing the Revolution: Darwinism for Social Scientists
Oxford, Oxford University Press.</ref> and Alcock (2001), ''The Triumph of Sociobiology''.<ref name="Alcock, John 2001">Alcock, John (2001). The Triumph of Sociobiology. Oxford: Oxford University Press. ISBN 978-0-19-516335-3</ref>).  Among their rebuttals are that some criticisms are [[Straw man|straw men]], are based on an incorrect nature versus nurture dichotomy, are based on misunderstandings of the discipline, etc.<ref name=AmPs2010/><ref name="Alcock, John 2001"/><ref>Segerstråle, Ullica Christina Olofsdotter (2000). Defenders of the truth : the battle for science in the sociobiology debate and beyond. Oxford [Oxfordshire]: Oxford University Press. ISBN 0-19-850505-1.</ref><ref>Barkow, Jerome (Ed.). (2006) Missing the Revolution: Darwinism for Social Scientists. Oxford: Oxford University Press. ISBN 978-0-19-513002-7</ref><ref>Tooby, J., Cosmides, L. & Barrett, H. C. (2005). Resolving the debate on innate ideas: Learnability constraints and the evolved interpenetration of motivational and conceptual functions. In Carruthers, P., Laurence, S. & Stich, S. (Eds.), The Innate Mind: Structure and Content. NY: Oxford University Press.</ref><ref>Controversies surrounding evolutionary psychology by Edward H. Hagen, Institute for Theoretical Biology, Berlin. In D. M. Buss (Ed.), The Handbook of Evolutionary Psychology (pp. 5–67). Hoboken, NJ: Wiley.</ref><ref>[http://www.psychologytoday.com/blog/homo-consumericus/200906/the-never-ending-misconceptions-about-evolutionary-psychology The Never-Ending Misconceptions About Evolutionary Psychology: Persistent Falsehoods About Evolutionary Psychology] by Gad Saad, Psychology Today blog.</ref><ref>Geher, G. (2006). Evolutionary psychology is not evil! … and here’s why … Psihologijske Teme (Psychological Topics); Special Issue on Evolutionary Psychology, 15, 181–202. [http://www2.newpaltz.edu/~geherg/ep_not_evil.pdf]</ref><ref>[http://www.psychologytoday.com/blog/cui-bono/201110/what-anti-evolutionary-psychologists-are-really-worried-about What Anti-Evolutionary Psychologists are Really Worried About] by John Johnson, Psychology Today blog.</ref>  [[Robert Kurzban]] suggested that " ...critics of the field, when they err, are not slightly missing the mark. Their confusion is deep and profound. It’s not like they are marksman{{sic}} who can’t quite hit the center of the target; they’re holding the gun backwards."<ref>Kurzban, R. (2013). [http://www.epjournal.net/blog/2013/07/this-one-goes-to-eleven-pz-myers-and-other-punch-lines/ This One Goes to Eleven, PZ Myers, and Other Punch Lines.]  Evolutionary Psychology.</ref>
 
==See also==
{{Wikipedia books|Evolutionary psychology}}
{{Portal|Evolutionary biology}}
{{cmn|4|
* [[Affective neuroscience]]
* [[Biocultural evolution]]
* [[Biosocial criminology]]
* [[Cognitive neuroscience]]
* [[Cultural neuroscience]]
* ''[[Darwinian Happiness]]''
* [[Darwinian literary studies]]
* [[Deep social mind]]
* [[Dunbar's number]]
* [[Ethnic nepotism]]
* [[Evolutionary aesthetics]]
* [[Evolutionary anthropology]]
* [[Evolutionary biology]]
* [[Evolutionary educational psychology]]
* [[Evolutionary epistemology]]
* [[Evolutionary linguistics]]
* [[Evolutionary medicine]]
* [[Evolutionary musicology]]
* [[Evolutionary neuroscience]]
* [[Evolutionary psychology research groups and centers]]
* [[List of evolutionary psychologists]]
* [[Molecular evolution]]
* [[Primate cognition]]
* [[Hominid intelligence]]
* [[Great ape language]]
* [[Primate empathy]]
* [[Chimpanzee intelligence]]
* [[Cooperative eye hypothesis]]
* [[Intersubjectivity]]
* [[Mirror neuron]]
* [[Origin of language]]
* [[Origin of speech]]
* [[Simulation theory of empathy]]
* [[Theory of mind]]
* [[Neuroethology]]
* [[Paleolithic diet]]
* [[Paleolithic lifestyle]]
* [[Social neuroscience]]
* [[Sociobiology]]
* [[Universal Darwinism]]
}}
 
==Notes==
{{Reflist|2}}
 
==References==
* {{cite book |author=Barkow, Jerome H. |title=Missing the Revolution: Darwinism for Social Scientists |publisher=Oxford University Press, USA |year= 2006|isbn=0-19-513002-2 |oclc= }}
* Barkow, J., Cosmides, L. & Tooby, J. 1992. The adapted mind: Evolutionary psychology and the generation of culture. Oxford: Oxford University Press.
* {{cite journal | last1 = Buss | first1 = D. M. | last2 = Barnes | first2 = M. | year = 1986 | title = Preferences in human mate selection | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/prefs_mate_selection_1986_jpsp.pdf | format = PDF | journal = Journal of Personality and Social Psychology | volume = 50 | issue = 3| pages = 559–70 | doi = 10.1037/0022-3514.50.3.559 }}
* {{cite journal | last1 = Buss | first1 = D. M. | year = 1988 | title = From  vigilance to violence: Tactics of mate retention in American undergraduates | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/Vigilance_to_Violence_1988.pdf | format = PDF | journal = Ethology and Sociobiology | volume = 9 | issue = 5| pages = 291–317 | doi = 10.1016/0162-3095(88)90010-6 }}
* {{cite journal | last1 = Buss | first1 = D. M. | year = 1989 | title = Sex differences in human mate preferences:  Evolutionary hypotheses tested in 37 cultures | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/SexDifferencesinHuman.PDF | journal = [[Behavioral and Brain Sciences]] | volume = 12 | pages = 1–49 | doi = 10.1017/S0140525X00023992 }}
* {{cite journal | last1 = Buss | first1 = D. M. | last2 = Larsen | first2 = R. J. | last3 = Westen | first3 = D. | last4 = Semmelroth | first4 = J. | year = 1992 | title = Sex differences in jealousy: Evolution, physiology, and psychology | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/SexDifferencesinJealousy.PDF | journal = Psychological Science | volume = 3 | issue = 4| pages = 251–55 | doi = 10.1111/j.1467-9280.1992.tb00038.x }}
* Buss, D. M. (1994). ''The evolution of desire: Strategies of human mating''. New York: Basic Books.
* {{cite book |author=Buss, David M. |title=Evolutionary psychology: the new science of the mind |publisher=Pearson/A and B |location=Boston |year=2004 |isbn=0-205-37071-3 |oclc= }}
* {{cite journal |url= http://www.sscnet.ucla.edu/comm/haselton/webdocs/spandrels.html |journal=American Psychologist |year=1998 |volume=53 |pages=533–48 |title=Adaptations, Exaptations, and Spandrels|first1=David M. |last1=Buss
|first2=Martie G. |last2=Haselton |first3=Todd K. |last3=Shackelford |first4=April L. |last4=Bleske |first5=Jerome C. |last5=Wakefield |accessdate=29 August 2011 |issue=5 |doi= 10.1037/0003-066X.53.5.533 |pmid= 9612136}}
* {{cite book |author=Clarke, Murray |title=Reconstructing reason and representation |publisher=MIT Press |location=Cambridge, Mass |year=2004 |isbn=0-262-03322-4 |oclc= }}
* Confer, Easton, Fleischman, Goetz, Lewis, Perilloux & Buss [http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/evolutionary_psychology_AP_2010.pdf Evolutionary Psychology], ''American Psychologist'', 2010.
* {{cite journal | last1 = Duntley | first1 = J.D. | last2 = Buss | first2 = D.M. | year = 2008 | title = Evolutionary psychology is a metatheory for psychology | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/duntleybuss2008.pdf | format = PDF | journal = Psychological Inquiry | volume = 19 | pages = 30–34 | doi = 10.1080/10478400701774105 }}
* Durrant, R., & Ellis, B.J. (2003). Evolutionary Psychology. In M. Gallagher & R.J. Nelson (Eds.), ''Comprehensive Handbook of Psychology, Volume Three: Biological Psychology'' (pp.&nbsp;1–33). New York: Wiley & Sons.
* {{cite book |author=Evan, Dylan |title=Introducing Evolutionary Psychology |publisher=Totem Books USA |location=Lanham, MD |year=2000 |isbn=1-84046-043-1 |oclc= }}
* Fruehwald, Edwin Scott, Law and Human Behavior: A Study in Behavioral Biology, Neuroscience, and The Law (Vandeplas 2011). ISBN 978-1-60042-144-0
* Gaulin, Steven J. C. and Donald H. McBurney. ''Evolutionary psychology''. Prentice Hall. 2003. ISBN 978-0-13-111529-3
* {{cite book |author=Joyce, Richard |title=The Evolution of Morality (Life and Mind: Philosophical Issues in Biology and Psychology) |publisher=The MIT Press |location=Cambridge, Mass |year= 2006|isbn=0-262-10112-2 |oclc= }}
* {{cite book |author=Miller, Geoffrey P. |title=The mating mind: how sexual choice shaped the evolution of human nature |publisher=Doubleday |location=Garden City, N.Y |year=2000 |isbn=0-385-49516-1 |oclc= }}
* Nesse, R.M. (2000). [http://www-personal.umich.edu/~nesse/Nesse-Tinbergen4Q.PDF Tingergen's Four Questions Organized].
* {{cite book| last1=[[Randolph M. Nesse|Nesse]] |first1=R | last2=[[George C. Williams|Williams]] |first2=George C. |title=Why We Get Sick |year=1996 |publisher=Vintage |location=NY}}
* {{cite book |author=Pinker, Steven |title=How the mind works |publisher=Norton |location=New York |year=1997 |isbn=0-393-04535-8 |oclc= }}
* {{cite book |author=Pinker, Steven |title=The blank slate: the modern denial of human nature |publisher=Viking |location=New York, N.Y |year=2002 |isbn=0-670-03151-8 |oclc= }}
* {{cite book |author=Richards, Janet C. |title=Human nature after Darwin: a philosophical introduction |publisher=Routledge |location=New York |year=2000 |isbn=0-415-21243-X |oclc= }}
* {{cite book |author=Ryan, C. & Jethá, C.|title= Sex at Dawn: The Prehistoric Origins of Modern Sexuality |publisher=Harper |location=New York, NY |year=2010 |isbn= 0-06-170780-5 |oclc= }}
* {{cite book |author=Santrock, John W. |title=The Topical Approach to Life-Span Development(3rd ed.) |publisher=McGraw Hill |location=New York, N.Y |year=2005 |isbn=0-07-322626-2 |oclc= }}
* Schacter, Daniel L, Daniel Wegner and Daniel Gilbert. 2007. ''Psychology''. Worth Publishers. ISBN 0-7167-5215-8 ISBN 9780716752158.
* {{cite journal | last1 = Schmitt | first1 = D. P. | last2 = Buss | first2 = D. M. | year = 2001 | title = Human mate poaching: Tactics and temptations for infiltrating existing relationships | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/Human_Mate_Poaching_2001.pdf | format = PDF | journal = Journal of Personality and Social Psychology | volume = 80 | issue = 6| pages = 894–917 | doi = 10.1037/0022-3514.80.6.894 | pmid = 11414373 }}
* Tooby, J. & Cosmides, L. (2005). Conceptual foundations of evolutionary psychology. In D. M. Buss (Ed.), ''The Handbook of Evolutionary Psychology'' (pp.&nbsp;5–67). Hoboken, NJ: Wiley. [http://www.psych.ucsb.edu/research/cep/papers/bussconceptual05.pdf Full text]
* {{cite book |author=Wilson, Edward Osborne ("E. O.") |title=Sociobiology: the new synthesis |publisher=Belknap Press of Harvard University Press |location=Cambridge |year=1975 |isbn=0674816218 |oclc= }}
* {{cite book |author=Wright, Robert C. M. |title=The moral animal: evolutionary psychology and everyday life |publisher=Vintage Books |location=New York |year=1995 |isbn=0-679-76399-6 |oclc= }}
 
==Further reading==
<!-- Notice: moved out of External links because they're really on-line versions of books (see talk page) -->
* {{cite journal | last1 = Buss | first1 = D. M. | authorlink = David Buss | year = 1995 | title = Evolutionary psychology: A new paradigm for psychological science | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/ANewParadigmforPsych.PDF | journal = Psychological Inquiry | volume = 6 | pages = 1–30 | doi = 10.1207/s15327965pli0601_1 }}
* {{cite journal | last1 = Confer | first1 = J.C. | last2 = Easton | first2 = J.A. | last3 = Fleischman | first3 = D.S. | last4 = Goetz | first4 = C. D. | last5 = Lewis | first5 = D.M.G. | last6 = Perilloux | first6 = C. | last7 = Buss | first7 = D. M. | year = 2010 | title = Evolutionary Psychology: Controversies, Questions, Prospects, and Limitations | url = http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/evolutionary_psychology_AP_2010.pdf | format = PDF | journal = American Psychologist | volume = 65 | issue = 2| pages = 110–26 | doi = 10.1037/a0018413 | pmid = 20141266 }}
* {{cite encyclopedia |last1=Cosmides |first1= Leda |authorlink1= Leda Cosmides |last2= Tooby |first2= John|authorlink2= John Tooby |editor-first=Ronald |editor-last=Hamowy |editor-link=Ronald Hamowy |encyclopedia=The Encyclopedia of Libertarianism |title= Evolution Psychology |url= http://books.google.com/books?id=yxNgXs3TkJYC  |accessdate= |edition= |year=2008 |publisher= [[SAGE Publications|SAGE]]; [[Cato Institute]] |location= Thousand Oaks, CA |id= |isbn= 978-1-4129-6580-4 |oclc=750831024| lccn = 2008009151 |pages= 158–61|quote= |ref= }}
* [[Francis Heylighen|Heylighen F.]] (2012).  "[http://pcp.vub.ac.be/Papers/EvolutionaryPsychology-QOL.pdf Evolutionary Psychology]", in: A. Michalos (ed.): Encyclopedia of Quality of Life Research (Springer, Berlin).
* {{cite journal|last=Kennair|first=L. E. O.|year=2002|title=Evolutionary psychology: An emerging integrative perspective within the science and practice of psychology|journal=Human Nature Review|volume=2|pages=17–61|url=http://www.human-nature.com/nibbs/02/ep.html}}
* {{cite web|url=http://homepage.uibk.ac.at/~c720126/humanethologie/ws/medicus/block1/inhalt.html|title=Evolutionary Theory of Human Sciences|last=Medicus|first=G.|year=2005|pages=9, 10, 11|accessdate=2009-09-08}}
* Oikkonen, Venla: ''Gender, Sexuality and Reproduction in Evolutionary Narratives.'' London: Routledge, 2013. ISBN 978-0-415-63599-8
 
==External links==
{{Library resources box
|by=no
|onlinebooks=no
|others=no
|about=yes
|label=evolutionary psychology}}
* {{dmoz|Science/Social_Sciences/Psychology/Evolutionary_Psychology|Evolutionary Psychology}}
* [http://www.systemsthinker.com/interests/mind/glabachep/glabachwhatisep.shtml What Is Evolutionary Psychology? by Clinical Evolutionary Psychologist Dale Glaebach].
* [http://www.psychegames.com/evolutionary-psychology.htm  Evolutionary Psychology – Approaches in Psychology]
 
===Academic societies===
* [http://www.hbes.com Human Behavior and Evolution Society]; international society dedicated to using evolutionary theory to study human nature
* [http://evolution.anthro.univie.ac.at/ishe The International Society for Human Ethology]; promotes ethological perspectives on the study of humans worldwide
* [http://www.ehbea.com/ European Human Behaviour and Evolution Association] an interdisciplinary society that supports the activities of European researchers with an interest in evolutionary accounts of human cognition, behavior and society
* [http://www.aplsnet.org/ The Association for Politics and the Life Sciences]; an international and interdisciplinary association of scholars, scientists, and policymakers concerned with evolutionary, genetic, and ecological knowledge and its bearing on political behavior, public policy and ethics.
* [http://www.sealsite.org/ Society for Evolutionary Analysis in Law] a scholarly association dedicated to fostering interdisciplinary exploration of issues at the intersection of law, biology, and evolutionary theory
* [http://www.une.edu/nei/ The New England Institute for Cognitive Science and Evolutionary Psychology] aims to foster research and education into the interdisciplinary nexus of cognitive science and evolutionary studies
* [http://www.neepsociety.com/ The NorthEastern Evolutionary Psychology Society];  regional society dedicated to encouraging scholarship and dialogue on the topic of evolutionary psychology
* [http://fepsociety.org/ Feminist Evolutionary Psychology Society] researchers that investigate the active role that females have had in human evolution
 
===Journals===
* [http://www.epjournal.net/ Evolutionary Psychology] — free access online scientific journal
* [http://www.sciencedirect.com/science/journal/10905138 Evolution and Human Behavior] – journal of the [http://www.hbes.com Human Behavior and Evolution Society]
* [http://www.politicsandthelifesciences.org/ Politics and the Life Sciences] – an interdisciplinary peer-reviewed journal published by the [http://www.aplsnet.org/ Association for Politics and the Life Sciences]
* [http://www.springer.com/social+sciences/anthropology+and+archaeology/journal/12110 Human Nature: An Interdisciplinary Biosocial Perspective] – advances the interdisciplinary investigation of the biological, social, and environmental factors that underlie human behavior. It focuses primarily on the functional unity in which these factors are continuously and mutually interactive. These include the evolutionary, biological, and sociological processes as they interact with human social behavior.
* [http://www.kli.ac.at/publications-a.html Biological Theory: Integrating Development, Evolution and Cognition] – devoted to theoretical advances in the fields of biology and cognition, with an emphasis on the conceptual integration afforded by evolutionary and developmental approaches.
* [http://www3.interscience.wiley.com/cgi-bin/jtoc?ID=38641 Evolutionary Anthropology]
* [http://www.bbsonline.org/ Behavioral and Brain Sciences] – interdisciplinary articles in psychology, neuroscience, behavioral biology, cognitive science, artificial intelligence, linguistics and philosophy.  About 30% of the articles have focused on evolutionary analyses of behavior.
* [http://www3.interscience.wiley.com/journal/118546131/home Evolution and Development] — research relevant to interface of evolutionary and developmental biology
* [http://www.evolutionaryreview.com/ed.htm The Evolutionary Review – Art, Science, and Culture]
 
===Videos===
* [https://www.youtube.com/watch?v=pEmX8Rim-hs Brief video clip re what EP is (from the "Evolution" PBS Series) ]
* [http://www.ted.com/index.php/talks/steven_pinker_chalks_it_up_to_the_blank_slate.html TED talk] by Steven Pinker about his book [[The Blank Slate|The Blank Slate: The Modern Denial of Human Nature]]
* [https://www.youtube.com/watch?v=PWHlvFiv70Q RSA talk] by evolutionary psychologist Robert Kurzban on  modularity of mind, based on his book ''Why Everyone (Else) is a Hypocrite''
* [https://www.youtube.com/watch?v=BzJUCG7L9I4 Richard Dawkins' lecture on natural selection and evolutionary psychology]
* [https://www.youtube.com/watch?v=z3X5AuKE9rg  Evolutionary Psychology-Steven Pinker & Frans de Waal] Audio recording
* [https://www.youtube.com/watch?v=nNW_B8EwgH4 Stone Age Minds: A conversation with evolutionary psychologists Leda Cosmides and John Tooby]
* [http://video.google.com/videoplay?docid=4165874976901589227&q=margaret+mead+and+samoa&total=8&start=0&num=10&so=0&type=search&plindex=0 Margaret Mead and Samoa].  Review of the nature versus nurture debate triggered by Mead's book "Coming of Age in Samoa."
* [http://vimeo.com/18751423 Secrets of the Tribe] Documents the conflicts between cultural and evolutionary anthropologists who have studied the Yanomamo tribes.
* [http://video.google.com/videoplay?docid=3554279466299738997  Video interview] with Steven Pinker by [[Robert Wright (journalist)]] discussing evolutionary psychology
* [http://video.google.com/videoplay?docid=-4975549474851602314 Video interview ] with [[Edward O. Wilson]] by Robert Wright (journalist), contextualizing evolutionary psychology within science, politics, academics and philosophy
 
{{Evolutionary psychology|state=expanded}}
{{evolution}}
{{Psychology}}
{{Use dmy dates|date=April 2012}}
 
{{DEFAULTSORT:Evolutionary Psychology}}
[[Category:Branches of psychology]]
[[Category:Evolutionary biology|psychology]]
[[Category:Evolutionary psychology| ]]
[[Category:Sexual attraction]]
[[Category:Human behavior]]
 
{{Link GA|de}}

Latest revision as of 11:42, 12 January 2015

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Il ouvre un dialogue dans les deux sens entre un enseignant et ses élèves, ce qui rend un milieu d'apprentissage plus dynamique que celle trouvée quand un enseignant est juste de donner une conférence .. Si vous décrochez le téléphone et il n'y a pas de tonalité, attendez avant de poser votre téléphone

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Je n'ai pas eu à boire depuis que j'ai écouté le premier CD et je suis étonné de voir comment je n'ai pas ressenti de pression interne à boire. Il a prévu un programme qui a produit un certain nombre de missiles réussis, l'aider à gagner le surnom Missile Man.

S'ils partagent vos messages, vous avez la possibilité d'atteindre des milliers. Vous pouvez travailler une maille coulée à n'importe quel moment après que vous avez commencé votre projet. Et puis une autre idée est que vous prenez votre chapeau et le type de lieu que vous connaissez Sac Longchamp Pas Cher Belgique des bruiteurs autour de la base de celui-ci, vous pouvez aussi mettre des bougies votives, et portez-vous certains de vos roses que nous avons ici, sorte de les placer dans

Air Jordan Homme Foot Locker par exemple

J'aime apprendre et à autant de connaissances que je peux, surtout quand il s'agit de ce que les aliments faire quoi, et ce qu'ils sont les avantages. Comme un hôpital privé dans le centre de Londres, L'Hôpital Portland offre un choix de services médicaux d'un hôpital pour enfants et spécialistes de l'hôpital des femmes.

C'est une ligne drôle, et aussi ironique en raison du fait que Taylor est marié à Stiller dans la vraie vie .. Si vous me faites attendre, vous perdez .. Air Jordan Homme Foot Locker En tant que membre de Flickr, vous pouvez déplacer votre souris sur copain l'icône de quelqu'un et cliquez sur la petite flèche pour ouvrir le menu «personne».

Avec de telles exigences de marge faible, un changement dans le taux de même quelques pips de change définit la différence entre un profit considérable et de perdre la totalité de la somme mettre en place pour un seul métier .. Utilisez l'icône FOX Nouvelles BlackBerry pour un accès en un clic à FOX Nouvelles

Bien que les gestionnaires financiers font face à un marché du travail concurrentiel, il a également un en croissance. Comme l'un de ces numéros vont jusqu'à, le moteur est demandé de faire plus de travail .. MILTON Sa vie a pris fin entre les mains d'un conducteur ivre présumé à l'âge de quatorze ans seulement.

Les choses iront mieux à un moment donné, mais qui ne peuvent pas venir jusqu'à la fin de 2013 ou le début de 2014 .. En cas d'abus, par exemple, des techniques simples de résolution des conflits ne peuvent vous mènera pas bien loin, et la sécurité personnelle doit prendre priorité.

Toutes ces pièces sont reliées par Air Max 90 Infrared un tube digestif .. Aujourd'hui marque neuf semaines à partir de la Mme Juste un de plus, je lui ai dit. Ce que je suis nerveux au sujet de la façon dont je vais traiter avec un autre (possible) l'échec, et le lendemain émotionnelle.

J'ai vu Pahan a commenté sur cette même question dans un de vos précédents essais .. Bien Barner, il est clair qu'elle avait beaucoup préfèrent la Air Max 90 Pas Cher paix à la guerre, elle le fait d'une manière qui est en fin de compte de respect envers ceux qui font des sacrifices dans le

Pour de nombreuses personnes à faible revenu, une augmentation du revenu peut signifier la perte de Medicaid, l'Earned Income Tax Credit et d'autres moyens d'avantages testés. Nous fournissons soit la vie de la nourriture a besoin pour faire son travail, ou il nous retenons. La loi de l'attraction sera en effet livrer, et New Balance Femme 420 il le fait à chaque fois.

Des études ont montré que les singes peuvent se souvenir des choses depuis environ quatre ans et anecdotes ont éléphants se souvenir pour environ 10, Bruck dit dans un article publié mercredi par Actes de la Royal Society B. A montré un clip de vous chanter "My Heart Will Go On" mais ne pouvait pas tout à fait frappé que l'on note élevée?

Nike Air Presto de détritus

J'ai adoré l'école de beauté, j'ai adoré être la Nike Air Presto shampouineuse, et j'aime être un styliste. Cela est particulièrement vrai si la plante est sous arrosé pendant des températures extrêmement élevées. L'étude «Planification de la retraite des soins: le revenu moyen Boomer Perspective», examine comment les attentes sur les besoins de soins de santé ont changé et les idées fausses boomers ont d'où leur viendra de soins et qui pourrait payer pour cela ..

Il ne devrait pas avoir beaucoup de pertinence en ce temps de guerre, parce que souvent la plupart des partis politiques sont mis de côté pour soutenir le président. Duke University est divisé en 10 écoles et collèges, dont beaucoup servent à la fois de premier cycle et les étudiants diplômés.

La terre de l'Australie peut fournir un Air Jordans Rouge domaine Longchamp Le Pliage Prix Canada Kin pour chaque famille à travers la Terre, chacun avec une forêt de la nourriture, de l'eau fraîche potable et beaucoup d'espace pour la construction d'habitats naturels fera Nike Air Max 90 Bruxelles pas de mal et avec beaucoup de terres laissées sur .. Sa campagne n'était pas disponible pour Chuchotements de commenter en raison de la prestation de serment, mais le porte-parole Justin Unga dit le Service Nouvelles Religion en Novembre Sinema Cela favorise une «approche laïque." Il a dit au New York Times le même mois que Sinema "estime de la non-théiste», les termes «athée» ou «non-croyants» ne sont pas digne de l'œuvre de sa vie ou de personnel de caractères "..

En Caroline du Nord, les gens qui s'entraident bourse, financés par Credit Union des travailleurs de l'Etat, offre de généreuses pensions à un diplôme supérieur de chacune des écoles secondaires publiques et charter de l'État. Axelrodi se compose de très petits crustacés, mésofaune, oeufs, algues, de détritus, et d'autres types de proies.

Téléchargements 6. Comme source de carburant, il est encore au stade de la recherche, mais la production avec l'énergie et les émissions de résultats renouvelables dans le transport gratuit PRATIQUEMENT pollution. Par exemple, avez-vous jamais, sorti de nulle part, pensé à un vieil ami et fait une note mentale de l'appeler à une date ultérieure?

Par conséquent, ce qui est souvent .. Ne jamais se contenter de quelque chose que vous ne pensez que vous allez aimer. Nouveau logiciel décrit dans thejournalEnvironmental science et Technologyattempts à part l'impact des émissions sur la santé de l'. Nous sommes aussi très célèbre pour notre cadre de T3 pour Joomla!

Chiens blottir pour nous la nuit, Gambol cours Daily marche à nos côtés, et le flop adoration à nos pieds quand nous avons nos canapés pour dormir. Je suppose qu'ils vont Publier il a gagné. Ensuite, vous vivez sans celui que vous pouvez faire avec l'utilitaire Absolument dehors, tel que le gaz.

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